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PRIMARY 4: MATHEMATICS – THIRD TERM | WEEK 1

Updated April 6, 2026Mathematics, Primary 4, Third Term

TOPIC: LENGTH – ESTIMATION AND MEASUREMENT

A: TEACHING AND LEARNING MATERIALS

  1. Metre rule.
  2. Measuring tape.
  3. Ruler.
  4. Objects of different lengths.
  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 learnt simple measurements and can identify common units such as centimetres and metres.

D: PERFORMANCE OBJECTIVES

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

  1. Identify common units of length.
  2. Measure objects in centimetres and metres.
  3. Estimate lengths and distances.
  4. Convert metres to centimetres.
  5. Convert kilometres to metres.
  6. Add and subtract simple lengths.

E: CONTENT

Meaning of Length

Length tells us how long, short, tall or far something is.
Common units of length are:

  • centimetre (cm)
  • metre (m)
  • kilometre (km)

📏 A ruler can measure small objects.
📐 A measuring tape can measure longer objects.

Relationship Between Units

100 cm = 1 m

1,000 m = 1 km

Examples:

3 m = 300 cm

2 km = 2,000 m

Estimation of Length

Estimation means making a sensible guess before measuring.
Example:
A classroom door may be about 2 metres high.

Addition of Length

4 m + 3 m = 7 m

Subtraction of Length

10 m – 4 m = 6 m

Word Problem

A boy walks 3 km in the morning and 2 km in the evening.
Total distance:

3 km + 2 km = 5 km

F: LESSON PRESENTATION

F1: Teachers’ Activities

  1. Revises common units of measurement.
  2. Shows pupils a ruler, metre rule and measuring tape.
  3. Demonstrates how to measure objects.
  4. Explains estimation of length.
  5. Demonstrates conversion of units.
  6. Gives addition and subtraction exercises involving length.

F2: Pupils’ Activities

  1. Identify units of length.
  2. Measure classroom objects.
  3. Estimate lengths before measuring.
  4. Convert metres to centimetres.
  5. Convert kilometres to metres.
  6. Add and subtract lengths.

G: CONCLUSION

The teacher revises centimetres, metres and kilometres and corrects pupils where necessary.
The teacher encourages pupils to practise measuring objects around them.

H: EVALUATION GUIDE

Pupils should be able to answer the following questions:

  1. How many centimetres make 1 metre?
  2. How many metres make 1 kilometre?
  3. Change 5 m to centimetres.
  4. Change 3 km to metres.
  5. Add: 6 m + 4 m.
  6. Subtract: 12 km – 5 km.
  7. Which unit is suitable for measuring the distance between two towns?