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.