TOPIC: ADDITION AND SUBTRACTION OF WHOLE NUMBERS
A: TEACHING AND LEARNING MATERIALS
- Number chart.
- Place value chart.
- Number cards.
- Counters.
- Pupils’ writing books and pencils.
B: REFERENCE MATERIALS
- Scheme of work.
- Recommended Mathematics textbook for Primary 4.
- Online educational resources.
C: PREVIOUS KNOWLEDGE
The pupils have learnt how to read, write and compare whole numbers and can perform simple addition and subtraction.
D: PERFORMANCE OBJECTIVES
By the end of the lesson, pupils should be able to:
- Add whole numbers correctly.
- Add numbers with regrouping.
- Subtract whole numbers correctly.
- Subtract numbers with regrouping.
- Solve simple word problems involving addition and subtraction.
E: CONTENT
Addition of Whole Numbers
Addition means putting numbers together.
Example:
2,345 + 1,234
2,345
\+ 1,234
——-
3,579
Addition with Regrouping
Example:
2,768 + 1,457
2,768
\+ 1,457
——-
4,225
Subtraction of Whole Numbers
Subtraction means taking one number away from another.
Example:
5,684 – 2,312
5,684
\- 2,312
——-
3,372
Subtraction with Regrouping
Example:
4,500 – 1,756 = 2,744
Word Problem
Ada has 2,450 oranges. She buys 1,250 more.
Total oranges:
2,450 + 1,250 = 3,700
F: LESSON PRESENTATION
F1: Teachers’ Activities
- Revises addition and subtraction facts.
- Demonstrates addition without regrouping.
- Demonstrates addition with regrouping.
- Demonstrates subtraction without regrouping.
- Explains subtraction with regrouping.
- Gives simple word problems.
F2: Pupils’ Activities
- Add given whole numbers.
- Regroup where necessary.
- Subtract given numbers.
- Solve subtraction problems.
- Solve simple word problems.
- Check answers carefully.
G: CONCLUSION
The teacher revises addition and subtraction of whole numbers.
The teacher corrects errors and reminds pupils to arrange digits according to their place values.
H: EVALUATION GUIDE
Pupils should be able to answer the following questions:
- Add: 2,415 + 3,220.
- Add: 4,786 + 2,457.
- Subtract: 6,845 – 2,312.
- Subtract: 7,000 – 3,475.
- A trader has 2,500 bags and receives 1,200 more. How many bags does she have?
- Chike had ₦8,000 and spent ₦3,250. How much is left?