Millimetres as a unit of measure and the relationship between them and cm | Maths

Starter quiz

I have a piece of ribbon that is 80 cm long. Is this ribbon shorter or longer than one metre?

longer

shorter ✓
Which unit would you use to measure the length of a swimming pool?

mm

cm

m ✓

kg
Match the calculation to its answer.

1 x 10 =

⇔

10 ✓

8 x 10 =

⇔

80 ✓

10 x 5 =

⇔

50 ✓

60 =

⇔

6 x 10 ✓

20 =

⇔

10 x 2 ✓

100 =

⇔

10 x 10 ✓
What is the length of this leaf?

'4 cm' ✓
If one metre is equal to 100 cm, how many cm are 6 metres equal to?

'600 cm' ✓
Convert the height of this house from centimetres to metres.

800 m

80 m

8 m ✓

Which unit of measurement is represented by the shading and arrow in this image?

Millimetres ✓

Centimetres

Metres
Which of these objects would you measure in millimetres?

Length of a football pitch.

Height of a house.

Width of a pencil. ✓

Length of a desk.
Which is smaller, one centimetre or one millimetre?

1 cm

1 mm ✓
Is the pebble shorter or longer than 1 cm?

shorter

longer ✓
Starting with the shortest, put these measurements in order of length.

1

⇔

3 mm

2

⇔

3 cm

3

⇔

31 mm

4

⇔

4 cm

5

⇔

45 mm

6

⇔

50 mm

7

⇔

10 cm
A piece of string is 90 mm long. 2 cm is cut off. What is the length of the piece of string now?

'7 cm' ✓

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Children may think that 10 mm are larger than 1 cm.

There are 10 mm in 1 cm. 1 cm is made up of 10 mm. 10 mm and 1 cm are equivalent in length.

Millimetre - A millimetre is a standardised unit of measurement. We can abbreviate millimetre to mm.