Changing millimetres to centimetres

Introduced in the Year 4 curriculum as: "Convert between different units of measure [for example, kilometre to metre; hour to minute]"

There are 10 millimetres in 1 centimetre .

10mm = 1cm.


Example 1:

20mm = 2cm

45cm = 450 mm


Example 2:

3.4cm = 34mm

690mm = 69cm

There are 10mm in 1cm.

To convert from cm to mm,

multiply 3.4cm by 10.

Remember! When multiplying by 10,

the digits move one space to the left.


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