Chapter 7 ยท ICSE Class 5 Math

Measurement

Length, weight, and capacity all use the same idea โ€” bigger units are made of smaller ones. Drag the slider and watch a length convert between units live.

The Conversion Machine
250 cm
2500
mm
2.5
m
0.0025
km
250 cm

Try it: set the slider to 100 cm โ€” that's exactly 1 metre.

The metric length ladder from millimetres to kilometres A staircase showing that 10 millimetres make 1 centimetre, 100 centimetres make 1 metre, and 1000 metres make 1 kilometre mm cm m km ร—10 ร—100 ร—1000 10 mm = 1 cm ยท 100 cm = 1 m ยท 1000 m = 1 km
7.1

Units of length

Length can be measured in different sized units, from tiny (millimetres) to huge (kilometres). Each unit is a fixed multiple of the next.

10 mm
= 1 cm
100 cm
= 1 m
1000 m
= 1 km
Everyday example โ€” Your pencil is about 15 cm long. Your classroom might be about 8 m long. The distance to your school might be measured in km. Same idea, different scale โ€” try the Conversion Machine above at 800 cm to see it in metres.
7.2

Units of weight

1Grams and kilograms

Weight is measured in grams (g) for lighter things and kilograms (kg) for heavier things.

1000 g = 1 kg

2Converting

Convert 2500 g to kg. Divide by 1000.

2500 g = 2.5 kg

3Converting back

Convert 3.2 kg to grams. Multiply by 1000.

3.2 kg = 3200 g

7.3

Units of capacity

1Millilitres and litres

Capacity (how much liquid something holds) is measured in millilitres (mL) for small amounts and litres (L) for larger amounts.

1000 mL = 1 L

2Converting

Convert 1500 mL to litres. Divide by 1000.

1500 mL = 1.5 L

7.4

Adding & subtracting measurements

1Same unit

A rope is 3 m 40 cm long. Another rope is 1 m 25 cm long. Find the total length.

3 m 40 cm + 1 m 25 cm = 4 m 65 cm

2With carrying

2 kg 700 g + 1 kg 500 g. Add the grams first: 700 + 500 = 1200 g = 1 kg 200 g.

2 kg 700 g + 1 kg 500 g = 4 kg 200 g

Watch out โ€” Always convert to the same unit before adding or subtracting. You can't directly add 2 km and 500 m without converting one of them first.
๐ŸŽฎ Measurement Mission

Complete the Bonus Mission

Answer 3 out of 4 correctly to complete this bonus mission and earn +50 XP.

Practice

Exercises

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Assess

Sample tests

Two 20-mark, 30-minute tests. Reveal answers question by question.