# Converting units of length

I can use knowledge of multiplication and division to convert units of length.

# Converting units of length

I can use knowledge of multiplication and division to convert units of length.

## Lesson details

### Key learning points

- There are 10 mm in 1 cm.
- There are 100 cm in 1 m.
- There are 1,000 m in 1 km.
- There are 1,000 mm in 1 m.
- There are 10 dm in 1 m.

### Common misconception

Children may confuse when to multiply or when to divide.

Encourage children to think about which unit of measure is larger e.g. km are larger than m. In a given amount, there will be fewer of the larger unit so we need to divide.

### Keywords

Convert - To convert means to change a value or expression from one form to another. In this context it means to change from one unit of measurement to another such as from cm to mm.

Decimetre - A decimetre is a metric unit of length, equal to one-tenth of a metre. Decimetre can be abbreviated to dm.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

Loading...

## Starter quiz

### 6 Questions

400

40

4

60

600

0

3.1

310

57.6

576

2.3

23

## Exit quiz

### 6 Questions

103 mm

130 mm

1,300 mm

1.3 m

10.3 m

25 dm

2.5 m

250 dm

2,500 cm

2,500 mm