Numbers

Integers – Addition of integers
Integers – Subtraction of integers

By the end of the lesson, the learner should be able to:
- perform addition of positive and negative integers using a number line;
- apply addition of integers to real-life situations;
- show interest in using integers in daily life.

In groups, learners are guided to:
- Discuss with peers and use number lines to add positive and negative integers
- Play games using number cards to practise addition of integers
- Solve real-life problems involving temperature increases using addition of integers

How do we carry out addition of integers in real-life situations?

- Mentor Mathematics Grade 9 pg. 1–2
- Number lines
- Number cards and charts
- Digital devices
- Mentor Mathematics Grade 9 pg. 2–3
- Thermometer charts

- Oral questions - Observation - Written exercises

Numbers

Integers – Multiplication of integers
Integers – Division of integers

By the end of the lesson, the learner should be able to:
- identify and state the rules for multiplying integers;
- work out multiplication of integers in different situations;
- show interest in multiplication of integers.

In groups, learners are guided to:
- Copy and complete multiplication tables for integers and identify sign patterns
- Discuss and state the four sign rules for multiplying integers
- Work out exercises on multiplication of positive and negative integers

What happens to the sign of a product when integers of different signs are multiplied?

- Mentor Mathematics Grade 9 pg. 3–5
- Multiplication tables charts
- Number cards
- Digital devices
- Mentor Mathematics Grade 9 pg. 5–6

- Written assignments - Oral questions - Observation

Numbers

Integers – Combined operations on integers

By the end of the lesson, the learner should be able to:
- work out combined operations on integers in the correct order;
- apply order of operations (BODMAS) to evaluate expressions involving integers;
- appreciate the importance of the correct order of operations.

In groups, learners are guided to:
- Work out combined operations using BODMAS with integer values
- Play games involving picking integer cards and performing combined operations in the correct order
- Discuss the effect of changing the order of operations through worked examples

Why is it important to follow the correct order when evaluating combined operations on integers?

- Mentor Mathematics Grade 9 pg. 6–7
- Number cards
- Calculators / digital devices

- Written assignments - Oral questions - Observation

Numbers

Integers – Real-life applications; use of IT tools
Cubes and Cube Roots – Cubes by multiplication

By the end of the lesson, the learner should be able to:
- apply integers to solve real-life problems in different situations;
- use IT tools to carry out operations on integers;
- appreciate the use of integers in everyday life.

In groups, learners are guided to:
- Use calculators and digital devices to carry out operations on integers
- Read temperature changes on a thermometer and record values using integers
- Discuss and solve real-life scenarios such as bank balances, building floors, and sports scores

How do we apply integers in our daily activities?

- Mentor Mathematics Grade 9 pg. 7–8
- Thermometer / temperature charts
- Calculators / digital devices
- Internet access
- Mentor Mathematics Grade 9 pg. 9–12
- Unit cube models / stacks
- Digital devices

- Oral questions - Written exercises - Observation

Numbers

Cubes and Cube Roots – Cubes from mathematical tables
Cubes and Cube Roots – Cube roots by factor method

By the end of the lesson, the learner should be able to:
- read cubes of numbers from mathematical tables;
- use the mean differences (ADD) column to find cubes of numbers not listed directly;
- apply mathematical tables efficiently to find cubes.

In groups, learners are guided to:
- Study the layout of the table of cubes and identify rows, columns, and the ADD section
- Follow step-by-step procedures to read cube values from mathematical tables
- Use mean differences to find cubes of numbers not listed directly in the table

How do we use mathematical tables to find the cube of a number?

- Mentor Mathematics Grade 9 pg. 12–17
- Mathematical tables (table of cubes)
- Digital devices
- Mentor Mathematics Grade 9 pg. 17–18
- Factor tree charts

- Written assignments - Oral questions - Observation

Numbers

Cubes and Cube Roots – Cube roots from mathematical tables

By the end of the lesson, the learner should be able to:
- determine cube roots of numbers from mathematical tables;
- use the ADD column to refine cube root readings using mean differences;
- appreciate the efficiency of mathematical tables in finding cube roots.

In groups, learners are guided to:
- Identify the cube root table and understand its structure (rows, columns, ADD section)
- Follow step-by-step procedures to read cube root values from the table of cubes
- Practise reading cube roots of various numbers, using mean differences where necessary

How do we use mathematical tables to find the cube root of a number?

- Mentor Mathematics Grade 9 pg. 18–19
- Mathematical tables (table of cubes)
- Digital devices

- Written tests - Oral questions - Observation

Numbers

Cubes and Cube Roots – Cube roots from mathematical tables

By the end of the lesson, the learner should be able to:
- determine cube roots of numbers from mathematical tables;
- use the ADD column to refine cube root readings using mean differences;
- appreciate the efficiency of mathematical tables in finding cube roots.

In groups, learners are guided to:
- Identify the cube root table and understand its structure (rows, columns, ADD section)
- Follow step-by-step procedures to read cube root values from the table of cubes
- Practise reading cube roots of various numbers, using mean differences where necessary

How do we use mathematical tables to find the cube root of a number?

- Mentor Mathematics Grade 9 pg. 18–19
- Mathematical tables (table of cubes)
- Digital devices

- Written tests - Oral questions - Observation

Numbers

Cubes and Cube Roots – Using a calculator

By the end of the lesson, the learner should be able to:
- use a calculator to find cubes of numbers;
- use a calculator to determine cube roots of numbers;
- appreciate the use of technology in computing cubes and cube roots.

In groups, learners are guided to:
- Demonstrate how to use the cube (x³) button on a scientific calculator to find cubes
- Demonstrate how to use the shift + x³ button to find cube roots on a calculator
- Solve exercises using a calculator and compare results with mathematical table values

Where do we apply cubes and cube roots in real-life situations?

- Mentor Mathematics Grade 9 pg. 19–20
- Scientific calculators
- Digital devices / internet access

- Oral questions - Written exercises - Observation

Numbers

Indices and Logarithms – Numbers in index form

By the end of the lesson, the learner should be able to:
- express numbers in index form in different situations;
- identify the base and index (exponent) in a given expression;
- appreciate the use of index notation to represent repeated multiplication.

In groups, learners are guided to:
- Study number cards showing repeated multiplication expressed in index form and identify the base and index
- Express repeated multiplication as indices (e.g. 2×2×2 = 2³)
- Write numbers such as 81, 64, and 125 in their simplest index form

How do we express numbers as powers?

- Mentor Mathematics Grade 9 pg. 20–22
- Number cards / index form charts
- Digital devices

- Oral questions - Written exercises - Observation

Numbers

Indices and Logarithms – Laws of indices (multiplication law)

By the end of the lesson, the learner should be able to:
- generate the multiplication law of indices (aᵐ × aⁿ = aᵐ⁺ⁿ);
- apply the multiplication law to simplify expressions in index form;
- show interest in working with laws of indices.

In groups, learners are guided to:
- Write numbers in expanded form and multiply to verify that aᵐ × aⁿ = aᵐ⁺ⁿ
- Simplify expressions using the multiplication law and compare with expanded-form answers
- Discuss and share findings on the multiplication law with peers

How do we simplify the product of powers with the same base?

- Mentor Mathematics Grade 9 pg. 22–24
- Index law charts
- Digital devices

- Written assignments - Oral questions - Observation

Numbers

Indices and Logarithms – Laws of indices (division law; negative indices; zero index)

By the end of the lesson, the learner should be able to:
- generate and apply the division law of indices (aᵐ ÷ aⁿ = aᵐ⁻ⁿ);
- express numbers with negative indices using positive indices;
- apply the zero index rule (a⁰ = 1).

In groups, learners are guided to:
- Write numbers in expanded form and divide to verify the division law
- Derive the zero index rule from the division law (e.g. 3² ÷ 3² = 3⁰ = 1)
- Derive the rule for negative indices and re-express answers with positive indices

How do we simplify the quotient of powers with the same base?

- Mentor Mathematics Grade 9 pg. 24–26
- Index law charts
- Digital devices

- Written tests - Oral questions - Observation

Numbers

Indices and Logarithms – Laws of indices (power of a power; fractional indices)

By the end of the lesson, the learner should be able to:
- apply the power-of-a-power law ((aᵇ)ʸ = aᵇʸ) to simplify expressions;
- evaluate expressions involving fractional indices;
- appreciate the interconnection of the laws of indices.

In groups, learners are guided to:
- Write numbers raised to a power in expanded form, multiply the indices, and verify the law
- Simplify expressions using the power-of-a-power law
- Evaluate expressions with fractional indices and relate them to roots (e.g. 27^(1/3) = ∛27)

How do we simplify expressions involving a power raised to another power?

- Mentor Mathematics Grade 9 pg. 24–27
- Index law charts
- Digital devices

- Written assignments - Oral questions - Observation

Numbers

Indices and Logarithms – Laws of indices (power of a power; fractional indices)

By the end of the lesson, the learner should be able to:
- apply the power-of-a-power law ((aᵇ)ʸ = aᵇʸ) to simplify expressions;
- evaluate expressions involving fractional indices;
- appreciate the interconnection of the laws of indices.

In groups, learners are guided to:
- Write numbers raised to a power in expanded form, multiply the indices, and verify the law
- Simplify expressions using the power-of-a-power law
- Evaluate expressions with fractional indices and relate them to roots (e.g. 27^(1/3) = ∛27)

How do we simplify expressions involving a power raised to another power?

- Mentor Mathematics Grade 9 pg. 24–27
- Index law charts
- Digital devices

- Written assignments - Oral questions - Observation

Numbers

Indices and Logarithms – Powers of 10; relating to common logarithms

By the end of the lesson, the learner should be able to:
- relate powers of 10 to common logarithms;
- express numbers as powers of 10;
- convert between index form and logarithmic notation.

In groups, learners are guided to:
- Study a table of powers of 10 alongside their logarithms and discuss the pattern
- Express numbers as powers of 10 and write the corresponding logarithmic notation
- Convert between index form (10ᵇ = y) and logarithmic notation (log₁₀ y = b)

How do powers of 10 relate to common logarithms?

- Mentor Mathematics Grade 9 pg. 25–27
- Powers-of-10 / logarithm reference table
- Mathematical log tables
- Digital devices

- Oral questions - Written exercises - Observation

Numbers

Indices and Logarithms – Reading logarithms from mathematical tables; using IT tools

By the end of the lesson, the learner should be able to:
- read common logarithms from mathematical tables;
- use a calculator or digital device to work out common logarithms;
- appreciate the use of mathematical tables and digital tools in computing logarithms.

In groups, learners are guided to:
- Study the structure of logarithm tables and practise reading logarithm values step by step
- Use a scientific calculator to compute common logarithms and compare results with table values
- Explore digital resources on indices and logarithms

How do we use mathematical tables and technology to determine the logarithm of a number?

- Mentor Mathematics Grade 9 pg. 27–29
- Mathematical log tables
- Scientific calculators
- Digital devices / internet access

- Written assignments - Oral questions - Observation

Numbers

Compound Proportions and Rates of Work – Proportional parts

By the end of the lesson, the learner should be able to:
- divide quantities into proportional parts in real-life situations;
- express each proportional part as a fraction of the whole;
- appreciate the use of proportional parts in fair sharing.

In groups, learners are guided to:
- Cut a strip of manila paper into different equal portions and express each as a fraction of the whole length
- Work out examples of dividing quantities (money, land, goods) into proportional parts using a given ratio
- Solve real-life sharing problems involving two or more people

How do we share quantities fairly using proportional parts?

- Mentor Mathematics Grade 9 pg. 29–31
- Manila paper and scissors
- Counters / cut-out strips
- Digital devices

- Oral questions - Written exercises - Observation

Numbers

Compound Proportions and Rates of Work – Relating ratios

By the end of the lesson, the learner should be able to:
- compare two ratios by expressing them as fractions, percentages, or decimals;
- identify the greater or smaller of two given ratios;
- apply ratio comparison to real-life situations.

In groups, learners are guided to:
- Express ratios as fractions over a common denominator and compare the numerators
- Express ratios as percentages or decimals and compare
- Solve real-life problems involving ratio comparison (e.g. comparing ingredient ratios, student ratios before and after admission)

How do we compare ratios to determine which is greater?

- Mentor Mathematics Grade 9 pg. 31–33
- Ratio comparison charts
- Fraction/percentage tables
- Digital devices

- Written assignments - Oral questions - Observation

Numbers

Compound Proportions and Rates of Work – Compound proportions (concept; four numbers in proportion; continued proportion)

By the end of the lesson, the learner should be able to:
- explain the concept of proportion and continued proportion;
- determine the fourth number when three numbers in a proportion are given;
- find the mean proportional between two numbers.

In groups, learners are guided to:
- Simplify pairs of ratios and determine whether four numbers are in proportion
- Solve for an unknown in a proportion using cross-multiplication
- Find the mean proportional between two numbers and verify through worked examples

How do we determine if four numbers are in proportion?

- Mentor Mathematics Grade 9 pg. 33–35
- Proportion charts
- Digital devices

- Oral questions - Written exercises - Observation

Numbers

Compound Proportions and Rates of Work – Compound proportions using ratio method (direct variation)

By the end of the lesson, the learner should be able to:
- identify quantities that vary directly in a compound proportion problem;
- set up and solve compound proportions using the ratio method for direct variation;
- apply direct-variation compound proportions to real-life situations.

In groups, learners are guided to:
- Identify which quantities increase or decrease together in given problems
- Set up ratios for direct-variation quantities and solve for the unknown using the ratio method
- Solve real-life compound proportion problems (e.g. workers, output, and time all varying directly)

How do we apply the ratio method to solve compound proportion problems involving direct variation?

- Mentor Mathematics Grade 9 pg. 35–36
- Worked example charts
- Digital devices

- Written assignments - Oral questions - Observation

Numbers

Compound Proportions and Rates of Work – Compound proportions using ratio method (direct variation)

By the end of the lesson, the learner should be able to:
- identify quantities that vary directly in a compound proportion problem;
- set up and solve compound proportions using the ratio method for direct variation;
- apply direct-variation compound proportions to real-life situations.

In groups, learners are guided to:
- Identify which quantities increase or decrease together in given problems
- Set up ratios for direct-variation quantities and solve for the unknown using the ratio method
- Solve real-life compound proportion problems (e.g. workers, output, and time all varying directly)

How do we apply the ratio method to solve compound proportion problems involving direct variation?

- Mentor Mathematics Grade 9 pg. 35–36
- Worked example charts
- Digital devices

- Written assignments - Oral questions - Observation

Numbers

Compound Proportions and Rates of Work – Compound proportions using ratio method (inverse variation)

By the end of the lesson, the learner should be able to:
- identify quantities that vary inversely in a compound proportion problem;
- correctly reverse the ratio for inverse-variation quantities;
- solve compound proportions involving both direct and inverse variation.

In groups, learners are guided to:
- Identify which quantities vary inversely in multi-variable problems
- Reverse the corresponding ratio for any inverse-variation quantity in the set-up
- Work out compound proportion problems combining both direct and inverse varying quantities

How do we handle inverse variation when solving compound proportions?

- Mentor Mathematics Grade 9 pg. 36–37
- Worked example charts
- Digital devices

- Written tests - Oral questions - Observation

Numbers

Compound Proportions and Rates of Work – Rates of work (concept; single worker or machine)

By the end of the lesson, the learner should be able to:
- define and explain rates of work in real-life situations;
- calculate the rate of work of a single person or machine (work done ÷ time taken);
- appreciate the concept of rates of work.

- Carry out a practical activity filling a basin with water using a jug, recording the rate of work (litres per minute) for each learner
- Work out the rate of work from given data using: rate = work done ÷ time taken
- Solve problems involving a single worker or machine completing a given task

How do we calculate the rate at which a task is completed?

- Mentor Mathematics Grade 9 pg. 37–38
- Water, jugs, and basin (practical)
- Rate-of-work problem cards
- Digital devices

- Oral questions - Observation - Written exercises

Numbers

Compound Proportions and Rates of Work – Rates of work (ratio method; more or fewer workers)

By the end of the lesson, the learner should be able to:
- determine the time taken when the number of workers changes, using the ratio method;
- identify whether more or fewer workers leads to more or fewer days;
- apply the ratio method to solve rates-of-work problems efficiently.

In groups, learners are guided to:
- Analyse worked examples showing that more workers reduce the days needed and fewer workers increase it (inverse relationship)
- Set up the ratio method for rates of work, reversing the ratio for the inverse relationship
- Work out exercises involving tractors, men, and machines completing the same task

How does the number of workers affect the time taken to complete a task?

- Mentor Mathematics Grade 9 pg. 38–40
- Rate-of-work problem cards
- Digital devices

- Written assignments - Oral questions - Observation

Numbers

Compound Proportions and Rates of Work – Rates of work (multi-step and multi-variable problems)

By the end of the lesson, the learner should be able to:
- solve multi-step rates-of-work problems in real-life situations;
- work out problems where more than two variables change simultaneously;
- show confidence in applying rates of work to complex situations.

In groups, learners are guided to:
- Work out problems where workers, days, and output all change at the same time
- Solve multi-step exercises combining different rates-of-work scenarios
- Discuss and verify solutions in peer groups, explaining reasoning

How do we solve problems where several variables in a rates-of-work situation change at the same time?

- Mentor Mathematics Grade 9 pg. 40–41
- Multi-step problem cards
- Digital devices

- Written tests - Oral questions - Observation

Numbers

Compound Proportions and Rates of Work – Real-life applications (wages, salaries, production output)

By the end of the lesson, the learner should be able to:
- apply compound proportions to solve problems involving wages and production output;
- relate the number of workers, days worked, and wages earned;
- appreciate the relevance of compound proportions in financial and production contexts.

In groups, learners are guided to:
- Work out problems linking number of workers, days worked, and total wages earned
- Solve production problems involving workers, time, and quantity produced
- Discuss and share solutions relating compound proportions to real salary and production scenarios

How do compound proportions help us solve salary and production problems in real life?

- Mentor Mathematics Grade 9 pg. 41–42
- Real-life scenario cards
- Digital devices

- Written assignments - Oral questions - Observation

Numbers

Compound Proportions and Rates of Work – Real-life applications (food consumption, construction, mixed contexts)

By the end of the lesson, the learner should be able to:
- apply compound proportions to food-consumption and construction problems;
- solve problems involving consumption rates, number of people, and time;
- appreciate the breadth of compound proportion applications in daily life.

In groups, learners are guided to:
- Work out food-consumption problems involving bags of maize, number of animals or people, and number of days
- Solve construction problems linking workers, days, and materials used
- Compare different real-life scenarios and classify each quantity as direct or inverse

Where else do we encounter compound proportions in daily life?

- Mentor Mathematics Grade 9 pg. 42–44
- Real-life scenario cards
- Digital devices

- Written assignments - Oral questions - Observation

Algebra

Matrices — Identifying and representing matrices in different situations

By the end of the lesson, the learner should be able to:
- identify a matrix from a table of information in different situations;
- represent data from real-life tables as a matrix;
- reflect on the use of matrices in everyday life.

In groups, learners are guided to:
- Discuss real-life tables such as football league tables, travel schedules, and shopping lists and count their rows and columns
- Study the Kape Furniture Company production tables for 2022 and 2023 and represent each as a matrix
- Arrange items in rows and columns and discuss how to write a matrix using correct notation

How do we use matrices in real-life situations?

- Mentor Mathematics Grade 9 pg. 38–40
- Football league tables / travel schedules
- Squared paper
- Digital devices

- Oral questions - Observation - Written exercises

Algebra

Matrices — Determining the order of a matrix

By the end of the lesson, the learner should be able to:
- determine the order of a matrix by counting its rows and columns;
- state the order of a matrix in the form m × n;
- appreciate how the order of a matrix describes its structure.

In groups, learners are guided to:
- Organise objects in rows and columns and state the number of rows and columns
- Determine the order of matrices of different sizes (e.g. 2×3, 3×3, 1×4)
- Write two matrices of a specified order and compare with peers

How do we describe the size of a matrix?

- Mentor Mathematics Grade 9 pg. 40–42
- Squared paper
- Digital devices

- Oral questions - Written exercises - Observation

Algebra

Matrices — Determining the position of items in a matrix
Matrices — Determining compatibility of matrices for addition and subtraction

By the end of the lesson, the learner should be able to:
- determine the position of any element in a matrix using row and column notation (aᵢⱼ);
- locate specific elements when given their row-column position;
- show interest in the systematic organisation of data in matrices.

In groups, learners are guided to:
- Discuss and identify the position of each element in terms of its row and column
- Use notation aᵢⱼ to describe element positions (e.g. a₁₂ = element in row 1, column 2)
- Solve exercises identifying and locating elements in matrices of various orders

How do we locate a specific element in a matrix?

- Mentor Mathematics Grade 9 pg. 42–43
- Matrix position charts
- Digital devices
- Mentor Mathematics Grade 9 pg. 43–44
- Compatibility charts

- Oral questions - Written exercises - Observation

Algebra

Matrices — Addition of matrices
Matrices — Subtraction of matrices

By the end of the lesson, the learner should be able to:
- add compatible matrices by adding corresponding elements;
- solve real-life problems involving addition of matrices;
- show interest in using matrices to organise and combine data.

In groups, learners are guided to:
- Represent first-leg and second-leg football results as matrices and add them to get season totals
- Add matrices by adding elements in the same position
- Solve exercises on addition of matrices and find unknowns in matrix addition equations

How do we add matrices to combine real-life data?

- Mentor Mathematics Grade 9 pg. 44–45
- Football league tables
- Digital devices / internet (YouTube link)
- Mentor Mathematics Grade 9 pg. 45–47
- Matrix exercise cards
- Digital devices

- Written assignments - Oral questions - Observation

Algebra

Matrices — End-of-sub-strand written assessment

By the end of the lesson, the learner should be able to:
- consolidate all matrix concepts (identification, order, position, compatibility, addition, subtraction);
- solve a variety of matrix problems accurately;
- appreciate the importance of matrices in organising and processing data.

In groups, learners are guided to:
- Complete a variety of revision exercises on all matrix concepts
- Solve mixed problems: represent tables as matrices, state order, locate elements, add and subtract matrices
- Complete a short end-of-sub-strand written assessment

How do we use matrices to solve real-life problems?

- Mentor Mathematics Grade 9 pg. 38–47
- Assessment papers
- Digital devices

- Written assessment - Oral questions - Observation

Algebra

Equations of a Straight Line — Identifying gradient; gradient as a measure of steepness

By the end of the lesson, the learner should be able to:
- identify the gradient of a straight line in real-life situations;
- describe gradient as the ratio of vertical distance to horizontal distance;
- appreciate gradient as a measure of steepness in everyday environments.

In groups, learners are guided to:
- Discuss steepness from the immediate environment: ladders, stairs, hills, and ramps
- Use an adjustable ladder inclined at different positions on a wall to demonstrate change in steepness
- Observe and climb stairs or hills and relate the experience to gradient
- Discuss positive, negative, zero, and undefined gradients from real-life examples

How do we use gradient or steepness in our daily activities?

- Mentor Mathematics Grade 9 pg. 48–50
- Adjustable ladder (practical)
- Gradient/slope diagrams
- Digital devices

- Oral questions - Observation - Written exercises

Algebra

Equations of a Straight Line — Calculating the gradient of a line from two known points (m = (y₂−y₁)/(x₂−x₁))

By the end of the lesson, the learner should be able to:
- derive and apply the formula m = (y₂ − y₁)/(x₂ − x₁) to calculate gradient;
- calculate the gradient of a line from two given points;
- identify whether the gradient is positive, negative, zero, or undefined.

In groups, learners are guided to:
- Study graphs and count vertical and horizontal steps between two points on a line
- Derive the gradient formula using change in y ÷ change in x
- Calculate gradients from given pairs of coordinates and from graphs
- Classify lines as having positive, negative, zero, or undefined gradients

How do we calculate the gradient of a line passing through two points?

- Mentor Mathematics Grade 9 pg. 50–52
- Graph paper / Cartesian plane charts
- Digital devices / internet (YouTube link)

- Written assignments - Oral questions - Observation

Algebra

Equations of a Straight Line — Determining the equation of a straight line given two points

By the end of the lesson, the learner should be able to:
- find the gradient of a line from two given points;
- derive the equation of a straight line given two points using the gradient formula;
- apply the method to find equations for sides of triangles and parallelograms.

In groups, learners are guided to:
- Follow step-by-step procedure: find gradient, pick one point plus P(x,y), set up gradient equation, cross-multiply and simplify
- Find equations of lines passing through various pairs of coordinates
- Find equations of lines AB, BC, AC for a triangle with given vertices

How do we determine the equation of a line when we know two points on it?

- Mentor Mathematics Grade 9 pg. 52–55
- Graph paper
- Worked example charts
- Digital devices

- Written assignments - Oral questions - Observation

Algebra

Equations of a Straight Line — Determining the equation of a straight line from a known point and gradient

By the end of the lesson, the learner should be able to:
- find the equation of a straight line given one point and the gradient;
- set up the gradient equation and simplify to get the line equation;
- show interest in applying the method to different point-gradient combinations.

In groups, learners are guided to:
- Follow step-by-step procedure: use given point B(x₁,y₁) and point C(x,y), form gradient ratio equal to given m, cross-multiply and simplify
- Solve exercises given various points and gradients (including fractional and negative gradients)
- Verify answers by substituting the given point back into the derived equation

How do we find the equation of a line when we know one point and its gradient?

- Mentor Mathematics Grade 9 pg. 55–57
- Worked example charts
- Graph paper
- Digital devices

- Written assignments - Oral questions - Observation

Algebra

Equations of a Straight Line — Expressing the equation of a straight line in the form y = mx + c

By the end of the lesson, the learner should be able to:
- rearrange any linear equation into the form y = mx + c;
- identify the gradient m and y-intercept c directly from the equation;
- appreciate the usefulness of the y = mx + c form in describing a line.

In groups, learners are guided to:
- Rearrange equations step by step: isolate y by moving x-terms to the right and dividing by the coefficient of y
- Identify gradient and y-intercept from equations already in y = mx + c form
- Complete tables matching equations, gradients, and y-intercepts
- Convert equations such as 4y + 3x − 2 = 0 into y = mx + c

How do we rewrite the equation of a straight line in the form y = mx + c?

- Mentor Mathematics Grade 9 pg. 57–59
- Equation rearrangement charts
- Digital devices

- Written tests - Oral questions - Observation

Algebra

Equations of a Straight Line — Interpreting the gradient m and y-intercept c in y = mx + c

By the end of the lesson, the learner should be able to:
- interpret m as the gradient and c as the y-intercept in the equation y = mx + c;
- complete tables of values and draw straight-line graphs from equations;
- recognise the use of equations of straight lines in real-life situations.

In groups, learners are guided to:
- Study the equation y = 2x + 4: discuss the coefficient of x as the gradient and the constant as the y-intercept
- Complete tables of values for given equations and use them to draw lines on a Cartesian plane
- Interpret real-life linear relationships using gradient and intercept
- Use digital devices or other resources to show different hills and relate to gradient

How does the equation y = mx + c describe a straight line?

- Mentor Mathematics Grade 9 pg. 59–61
- Graph paper / Cartesian plane
- Digital devices

- Written assignments - Oral questions - Observation

Algebra

Equations of a Straight Line — Interpreting the gradient m and y-intercept c in y = mx + c

By the end of the lesson, the learner should be able to:
- interpret m as the gradient and c as the y-intercept in the equation y = mx + c;
- complete tables of values and draw straight-line graphs from equations;
- recognise the use of equations of straight lines in real-life situations.

In groups, learners are guided to:
- Study the equation y = 2x + 4: discuss the coefficient of x as the gradient and the constant as the y-intercept
- Complete tables of values for given equations and use them to draw lines on a Cartesian plane
- Interpret real-life linear relationships using gradient and intercept
- Use digital devices or other resources to show different hills and relate to gradient

How does the equation y = mx + c describe a straight line?

- Mentor Mathematics Grade 9 pg. 59–61
- Graph paper / Cartesian plane
- Digital devices

- Written assignments - Oral questions - Observation

Algebra

Equations of a Straight Line — Determining the x-intercept and y-intercept

By the end of the lesson, the learner should be able to:
- determine the x-intercept by substituting y = 0 in a line equation;
- determine the y-intercept by substituting x = 0 in a line equation;
- use intercepts to draw straight-line graphs on a Cartesian plane.

In groups, learners are guided to:
- Discuss the meaning of x-intercept (where the line crosses the x-axis, y = 0) and y-intercept (where the line crosses the y-axis, x = 0)
- Draw lines y = x+2, y = x+5, y = x−3 and record their intercepts in a table
- Calculate x and y-intercepts for various equations including 3x + 2y = 12

How do we find where a straight line crosses the axes?

- Mentor Mathematics Grade 9 pg. 61–63
- Graph paper / Cartesian plane
- Digital devices

- Written exercises - Oral questions - Observation

Algebra

Equations of a Straight Line — End-of-sub-strand written assessment

By the end of the lesson, the learner should be able to:
- demonstrate mastery of all straight-line concepts;
- solve a variety of problems accurately;
- appreciate the application of straight-line equations in everyday contexts.

In groups, learners are guided to:
- Complete assessment exercises covering gradient, equation of a line (two points and point-gradient), y = mx + c form, interpretation, and intercepts
- Correct and discuss solutions as a class

How do we apply equations of straight lines to solve problems?

- Mentor Mathematics Grade 9 pg. 48–64
- Assessment papers
- Graph paper
- Digital devices

- Written assessment - Oral questions - Observation

Algebra

Linear Inequalities — Solving linear inequalities in one unknown

By the end of the lesson, the learner should be able to:
- form linear inequalities from real-life statements;
- solve linear inequalities in one unknown using inverse operations;
- note that dividing or multiplying by a negative number reverses the inequality sign.

In groups, learners are guided to:
- Discuss real-life inequality statements (e.g. "a number multiplied by 4 minus 5 is greater than the number multiplied by 3 plus 2") and form inequalities
- Solve inequalities by adding, subtracting, multiplying, or dividing both sides — noting the sign reversal rule for negatives
- Solve exercises involving fractional and compound inequalities

How do we solve linear inequalities in one unknown?

- Mentor Mathematics Grade 9 pg. 65–67
- Inequality statement cards
- Digital devices / internet (YouTube link)

- Oral questions - Written exercises - Observation

Algebra

Linear Inequalities — Representing linear inequalities in one unknown on a number line and on a Cartesian plane

By the end of the lesson, the learner should be able to:
- represent linear inequalities in one unknown on a graph;
- use a continuous line for ≤ or ≥ and a broken line for < or >;
- shade the unwanted region to indicate the solution set.

In groups, learners are guided to:
- Draw a number line and represent simple inequalities such as x < 4 and x ≥ −3
- Follow steps: treat inequality as an equation, draw the boundary line (broken or continuous), test a point, shade unwanted region
- Solve inequalities and represent the solution on a graph (e.g. 2y − 4 ≤ 2)

How do we represent inequalities in one unknown on a graph?

- Mentor Mathematics Grade 9 pg. 67–70
- Graph paper / Cartesian plane
- Digital devices

- Written assignments - Oral questions - Observation

Algebra

Linear Inequalities — Representing linear inequalities in two unknowns graphically

By the end of the lesson, the learner should be able to:
- generate a table of values and draw the boundary line for a linear inequality in two unknowns;
- test a point to determine which region satisfies the inequality;
- shade the unwanted region and identify the required region.

In groups, learners are guided to:
- Generate a table of values for the line y = 3x and draw the boundary (continuous line for ≤); test point (1,1) — is 1 ≤ 3(1)? — to identify the required region
- Represent inequalities such as y > 2x − 2 using a broken boundary line, test a point, and shade the unwanted region
- Identify inequalities represented by given shaded graphs

How do we represent a linear inequality in two unknowns on a graph?

- Mentor Mathematics Grade 9 pg. 70–72
- Graph paper / Cartesian plane
- Digital devices

- Written tests - Oral questions - Observation

Algebra

Linear Inequalities — End-of-sub-strand written assessment

By the end of the lesson, the learner should be able to:
- consolidate all linear inequality concepts: solving, one-variable graphs, two-variable graphs, and real-life applications;
- solve a variety of inequality problems accurately;
- appreciate the use of linear inequalities in real-life decision-making.

In groups, learners are guided to:
- Complete mixed exercises: solve inequalities in one unknown, represent on graphs, represent two-unknown inequalities graphically, solve word problems
- Complete a short end-of-sub-strand written assessment
- Correct and discuss solutions as a class

How do we apply linear inequalities to solve and represent real-life situations?

- Mentor Mathematics Grade 9 pg. 65–73
- Assessment papers
- Graph paper
- Digital devices

- Written assessment - Oral questions - Observation

Algebra

Linear Inequalities — End-of-sub-strand written assessment

By the end of the lesson, the learner should be able to:
- consolidate all linear inequality concepts: solving, one-variable graphs, two-variable graphs, and real-life applications;
- solve a variety of inequality problems accurately;
- appreciate the use of linear inequalities in real-life decision-making.

In groups, learners are guided to:
- Complete mixed exercises: solve inequalities in one unknown, represent on graphs, represent two-unknown inequalities graphically, solve word problems
- Complete a short end-of-sub-strand written assessment
- Correct and discuss solutions as a class

How do we apply linear inequalities to solve and represent real-life situations?

- Mentor Mathematics Grade 9 pg. 65–73
- Assessment papers
- Graph paper
- Digital devices

- Written assessment - Oral questions - Observation

Algebra
Measurements

2.1–2.3 Algebra — Strand 2 consolidation: matrices, equations of a straight line, and linear inequalities
Area — Area of a regular pentagon

By the end of the lesson, the learner should be able to:
- review and consolidate all Strand 2 concepts across the three sub-strands;
- solve mixed problems involving matrices, straight-line equations, and linear inequalities;
- show confidence in applying algebra to solve real-life problems.

In groups, learners are guided to:
- Work through mixed strand revision exercises covering matrices, equations of straight lines, and linear inequalities
- Identify connections between topics: e.g. graphing lines relates to graphing inequalities
- Peer-review solutions and discuss common mistakes
- Use digital devices or graphing tools to verify graphs and equations

How do matrices, equations of straight lines, and linear inequalities connect to real-life problems?

- Mentor Mathematics Grade 9 pg. 38–73 (revision exercises)
- Graph paper
- Revision exercise sheets
- Digital devices
- Mentor Mathematics Grade 9 pg. 73–75
- Cut-outs of pentagons and hexagons
- Ruler and pair of compasses

- Written tests - Oral questions - Peer assessment

Measurements

Area — Area of a regular hexagon

By the end of the lesson, the learner should be able to:
- identify the properties of a regular hexagon;
- calculate the area of a regular hexagon by dividing it into six equal triangles from the centre;
- apply area of a hexagon to real-life situations such as tiling.

In groups, learners are guided to:
- Trace and cut out a hexagon, measure the perpendicular height ON of one triangle, and calculate the area of all six triangles
- Derive: Area of hexagon = area of one triangle × 6
- Solve problems involving hexagonal trampolines, tiling areas, and road signs
- Explore ethno-math patterns in fabrics and structures involving hexagons

How do we work out the area of a hexagon?

- Mentor Mathematics Grade 9 pg. 73–76
- Cut-outs of hexagons
- Ruler and pair of compasses
- Digital devices

- Oral questions - Written exercises - Observation

Measurements

Area — Surface area of rectangular-based prisms (cuboids)
Area — Surface area of triangular-based prisms

By the end of the lesson, the learner should be able to:
- identify the faces of a rectangular-based prism and sketch its net;
- work out the surface area of a closed cuboid using SA = 2lw + 2lh + 2wh;
- apply surface area of rectangular prisms to real-life contexts such as packaging and painting.

In groups, learners are guided to:
- Collect rectangular prism models; cut along edges to separate the six faces
- Measure length and width of each face, calculate individual areas, and sum all six
- Apply the formula SA = 2lw + 2lh + 2wh to solve problems: painting walls, making packaging boxes, and coating metallic tanks

How do we work out the surface area of a rectangular prism?

- Mentor Mathematics Grade 9 pg. 76–79
- Rectangular prism models
- Rulers and scissors
- Digital devices
- Mentor Mathematics Grade 9 pg. 79–81
- Triangular prism models
- Digital devices / internet (YouTube link)

- Written assignments - Oral questions - Observation

Measurements

Area — Surface area of square, rectangular, and triangular-based pyramids
Area — Area of a sector; area of a segment of a circle

By the end of the lesson, the learner should be able to:
- sketch the net of a pyramid and identify its base and triangular faces;
- calculate the total surface area of square, rectangular, and triangular-based pyramids;
- apply surface area of pyramids to real-life problems.

In groups, learners are guided to:
- Use models of square, rectangular, and triangular pyramids; cut open along edges to get the net
- Measure the faces and calculate area of base + area of all triangular faces
- Solve problems: Great Pyramid of Giza, playing arenas, and cost of painting pyramid-shaped structures

How do we find the total surface area of a pyramid?

- Mentor Mathematics Grade 9 pg. 81–85
- Pyramid models
- Rulers and scissors
- Digital devices
- Mentor Mathematics Grade 9 pg. 85–91
- Circle cut-outs with sectors and segments
- Pair of compasses and ruler

- Written assignments - Oral questions - Observation

Measurements

Area — Surface area of a cone (curved surface and total surface area)

By the end of the lesson, the learner should be able to:
- derive the curved surface area of a cone from the net of a sector: CSA = πrl;
- calculate the total surface area of a closed cone: TSA = πrl + πr²;
- solve real-life problems involving cones such as ice cream containers, paper hats, and funnels.

In groups, learners are guided to:
- Use card paper to draw and cut out a sector of radius 7 cm; fold it into a cone and identify the curved surface as the sector
- Derive: Curved surface area = πrl; Total surface area = πrl + πr² (closed cone); open cone = πrl only
- Solve problems: surface area of ice cream cones, birthday paper hats, and ground-nut containers

How do we find the total surface area of a cone?

- Mentor Mathematics Grade 9 pg. 91–93
- Card paper and scissors
- Pair of compasses
- Scientific calculators
- Digital devices

- Written tests - Oral questions - Observation