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PRIMARY 4: MATHEMATICS – THIRD TERM | WEEK 2

Updated April 13, 2026Mathematics, Primary 4, Third Term

TOPIC: WEIGHT – GRAMS AND KILOGRAMS

A: TEACHING AND LEARNING MATERIALS

  1. Weighing scale.
  2. Samples of food items.
  3. Objects of different weights.
  4. Weight cards.
  5. Pupils’ writing books and pencils.

B: REFERENCE MATERIALS

  1. Scheme of work.
  2. Recommended Mathematics textbook for Primary 4.
  3. Online educational resources.

C: PREVIOUS KNOWLEDGE

The pupils have seen weighing scales and know that some objects are heavier or lighter than others.

D: PERFORMANCE OBJECTIVES

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

  1. Explain the meaning of weight.
  2. Identify grams and kilograms.
  3. Measure the weight of simple objects.
  4. Convert kilograms to grams.
  5. Add and subtract weights.
  6. Solve simple word problems involving weight.

E: CONTENT

Meaning of Weight

Weight tells us how heavy or light an object is.
Common units of weight are:

  • gram (g)
  • kilogram (kg)

⚖️ A weighing scale is used to measure weight.

Relationship Between Grams and Kilograms

1,000 g = 1 kg

Examples:

2 kg = 2,000 g

5 kg = 5,000 g

Addition of Weight

3 kg + 4 kg = 7 kg

Subtraction of Weight

9 kg – 5 kg = 4 kg

Multiplication of Weight

2 kg × 4 = 8 kg

Division of Weight

12 kg ÷ 3 = 4 kg

Word Problem

A bag of rice weighs 5 kg and a bag of beans weighs 3 kg.
Total weight:

5 kg + 3 kg = 8 kg

F: LESSON PRESENTATION

F1: Teachers’ Activities

  1. Introduces the meaning of weight.
  2. Displays objects of different weights.
  3. Demonstrates how to use a weighing scale.
  4. Explains grams and kilograms.
  5. Demonstrates conversion of units.
  6. Gives simple calculations involving weight.

F2: Pupils’ Activities

  1. Compare heavy and light objects.
  2. Identify grams and kilograms.
  3. Observe how objects are weighed.
  4. Convert kilograms to grams.
  5. Add and subtract weights.
  6. Solve simple weight problems.

G: CONCLUSION

The teacher revises grams and kilograms and reminds pupils that 1,000 grams make 1 kilogram.
The teacher corrects pupils where necessary.

H: EVALUATION GUIDE

Pupils should be able to answer the following questions:

  1. What instrument is used to measure weight?
  2. How many grams make 1 kilogram?
  3. Change 4 kg to grams.
  4. Add: 5 kg + 7 kg.
  5. Subtract: 15 kg – 6 kg.
  6. Multiply: 3 kg × 4.
  7. Divide: 20 kg ÷ 5.