Length conversion
100 cm is the same as 1 m.
Centimetres are smaller than metres.
Year 4
Convert between different units of measure
Convert between related units of measure by using the size relationship between them.
Lesson overview
Measurement
Some units measure the same kind of thing but at different sizes. For example, 100 centimetres make 1 metre and 1000 grams make 1 kilogram. Knowing these links helps us convert accurately.
Mass conversion
1000 g is the same as 1 kg.
Grams are smaller than kilograms.
Money conversion
100 p is the same as £1.
Pence and pounds are linked units.
Worked example
Convert 3 m into centimetres.
- 1 metre is 100 centimetres.
- 3 metres are 3 groups of 100 centimetres.
- 3 x 100 = 300.
- So 3 m = 300 cm.
Round 1: Learn it
Use the unit link first, then decide whether the number should be larger or smaller.
Finish this round to unlock Round 2: Show you know it.
Question 1
How many centimetres are in 2 m?
Question 2
How many grams are in 3 kg?
Question 3
How many pence are in £4?
Question 4
Which is equal to 500 cm?
Question 5
Which statement is true?
Common mistakes
Watch for these as you work through the lesson.
- Making the number smaller when converting into a smaller unit.
- Mixing the unit pairs.
- Forgetting that 100 p makes £1.
Related topics
These ideas connect closely to this lesson.
- Measure and calculate the perimeter of a rectilinear figure in centimetres and metres.
- Estimate, compare and calculate different measures, including money in pounds and pence.