Class: Primary 1
Term: Third Term
Week: 3
Age: 6 years
Duration: 45 minutes
Subject: Mathematics
Curriculum Theme: Mathematics
Previous Lesson: Subtraction.
Topic: Addition on Number Line
Subject Matter: The concept of number line (positive part only), Reading numbers on the number line

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Identify numbers on a number line.
Explain the concept of a number line.
Use a number line to perform simple addition problems.

Affective Domain:

Show interest in using the number line for addition.
Appreciate the number line as a tool for solving addition problems.

Psychomotor Domain:

Draw a simple number line.
Demonstrate addition by making jumps on a number line.

Work cooperatively with peers to solve addition problems using a number line.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum
State Unified Scheme of Work
New General Mathematics for Primary 1

Instructional Materials

The teacher will teach this lesson with the aid of:

Chalkboard and chalk
Number line chart
Flashcards with numbers
Counters

Rationale for the Lesson

This lesson helps pupils understand numbers visually and provides a concrete method for solving simple addition problems. It builds a strong foundation for more complex mathematical operations and helps them appreciate how numbers are ordered and combined.

Prerequisite/Previous Knowledge

Pupils can count numbers up to 10, identify numbers, and understand the basic concept of combining two groups (addition).

Lesson Content/Board Summary

Addition on Number Line

What is a Number Line?

A number line is a straight line with numbers placed at equal distances from each other. It helps us to see numbers in order and perform operations like addition.

Example of a number line (positive part only):

0 — 1 — 2 — 3 — 4 — 5 — 6 — 7 — 8 — 9 — 10

How to Add Using a Number Line

To add two numbers (e.g., a + b) using a number line, follow these steps:

Step 1: Find the first number (a) on the number line.
Step 2: From that number, jump forward by the second number (b). Each jump represents counting one unit.
Step 3: The number you land on after all the jumps is the answer (the sum).

Worked Example 1: Add 3 + 2

Step 1: Start at number 3 on the number line.

Step 2: Jump forward 2 times (two steps) from 3.

Step 3: You land on 5.

Therefore, 3 + 2 = 5.

Worked Example 2: Add 4 + 3

Step 1: Start at number 4 on the number line.

Step 2: Jump forward 3 times (three steps) from 4.

Step 3: You land on 7.

Therefore, 4 + 3 = 7.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and asks them to count numbers from 1 to 10. The teacher then asks simple mental addition questions like “What is 1 + 1?”
Pupils’ Activity: Pupils respond to greetings, count numbers, and answer the simple addition questions.
Learning Point: Pupils recall counting and basic addition, preparing them for the lesson.

Step 2: Concept of Number Line

Time: 7 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher introduces the number line using a chart, explaining that it is a straight line with numbers placed in order at equal intervals. The teacher points out the numbers from 0 to 10.
Pupils’ Activity: Pupils observe the number line chart and listen attentively to the explanation.
Learning Point: Pupils understand what a number line is and its basic structure.

Step 3: Reading Numbers on the Number Line

Time: 5 minutes
Teaching Skill: Questioning/Identification
Teacher’s Activity: The teacher points to different numbers on the number line chart and asks pupils to identify them. The teacher also asks pupils to show where specific numbers are located.
Pupils’ Activity: Pupils identify the numbers pointed to by the teacher and point to numbers as requested.
Learning Point: Pupils can correctly read and locate numbers on the number line.

Step 4: Demonstration of Addition on Number Line

Time: 8 minutes
Teaching Skill: Demonstration/Explanation
Teacher’s Activity: The teacher demonstrates how to add using the number line with examples like 3 + 2 and 4 + 3, clearly showing how to start at the first number and make jumps for the second number. The teacher explains that the landing point is the sum.
Pupils’ Activity: Pupils watch carefully as the teacher demonstrates, following the jumps with their eyes.
Learning Point: Pupils observe the step-by-step process of adding numbers on a number line.

Step 5: Guided Practice

Time: 8 minutes
Teaching Skill: Guided Practice
Teacher’s Activity: The teacher writes more addition problems on the board (e.g., 5 + 1, 2 + 4) and guides the pupils to solve them together using the number line chart. The teacher calls individual pupils to demonstrate.
Pupils’ Activity: Pupils actively participate, answering questions, and some come to the board to demonstrate addition on the number line.
Learning Point: Pupils practice and build confidence in using the number line for addition with teacher support.

Step 6: Independent Practice

Time: 5 minutes
Teaching Skill: Independent Work
Teacher’s Activity: The teacher writes simple addition problems (e.g., 6 + 2, 3 + 4, 1 + 5) on the board and asks pupils to solve them in their notebooks using a drawn number line.
Pupils’ Activity: Pupils draw their own number lines and solve the given addition problems independently.
Learning Point: Pupils apply their understanding to solve problems on their own.

Step 7: Evaluation/Review

Time: 5 minutes
Teaching Skill: Questioning/Assessment
Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

What is a number line?
Show me number 7 on a number line.
Use a number line to add 4 + 2.
Use a number line to add 5 + 3.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the lesson by reiterating how to use a number line for addition. The teacher assigns homework: “Draw a number line from 0 to 10 and use it to solve: a) 6 + 3, b) 2 + 5.”
Pupils’ Activity: Pupils listen to the summary and copy the homework into their notebooks.
Learning Point: Pupils consolidate their learning and have an opportunity for further practice.

Home Task: Solve two new exercises on Addition on Number Line. Show each step and check each answer.

Lesson Keywords

Number line – A straight line with numbers placed at equal intervals.
Addition – The process of combining numbers to find their sum.
Sum – The result of adding two or more numbers.
Jump – Moving along the number line to count or add.
Count – To say numbers in order or to find the total number of items.

Differentiation

For struggling learners, the teacher will provide pre-drawn number lines and use physical counters to demonstrate jumps before moving to the abstract number line. For advanced learners, the teacher will introduce slightly larger numbers or encourage them to create their own addition problems using the number line.

Note for teachers using this lesson plan

Ensure that the number line is clearly visible to all pupils, whether on a chart or drawn on the board. Emphasize the concept of making ‘jumps’ forward for addition. Encourage pupils to draw their own number lines in their notebooks for practice.