Millimetre
Contents
Key Stage 2
Meaning
A millimetre is a very short distance.
About Millimetres
- There are 1000 millimetres in one metre and 10 millimetres in one centimetre.
- An ant is around 4 millimetres long.
Key Stage 3
Meaning
A millimetre (mm) is a unit of distance equivalent to 1/1000th of a metre.
About Millimetres
- Millimetres are shortened to a lower case m and another lower case m.
- Millimetres can be used for the lengths of insects such as ants or the thickness of human skin.
Converting to Millimetres
| Unit | To convert | Millimetres |
| 1 Megametre (1Mm) | Convert to millimetres x1000,000,000. | 1000,000,000mm |
| 1 kilometre (1km) | Convert to millimetres x1000,000. | 1000,000mm |
| 1 metre (1m) | Convert to millimetres x1000. | 1,000mm |
| 1 millimetre 1(mm) | Convert to millimetres x1. | 1mm |
| 1 micrometre 1(µm) | Convert to millimetres /1000. | 0.001mm |
| 1 centimetre 1(cm) | Convert to millimetres x10. | 10mm |
Key Stage 4
Meaning
Millimetres (mm) are a unit of distance, displacement and wavelength 1,000 times smaller than the SI Unit; the Metre.
About Millimetres
- Millimetres are shortened to mm with a lower case m and another lower case m.
- Milli means one thousandth so there are 1,000 millimetres in a Metre.
Converting to Millimetres
| Unit | To convert | Millimetres |
| 1 megametre (1Mm) | Convert to millimetres x109 | 1x109mm |
| 1 kilometre (1km) | Convert to millimetres x106 | 1x106mm |
| 1 Metre (1m) | Convert to millimetres x103 | 1x103mm |
| 1 decimetre 1(dm) | Convert to millimetres x102 | 1x102mm |
| 1 centimetre 1(mm) | Convert to millimetres x101 | 1x101mm |
| 1 millimetre 1(mm) | Convert to millimetres x1 | 1mm |
| 1 micrometre 1(µm) | Convert to millimetres x10-3 | 1x10-3mm |
| 1 nanometre 1(nm) | Convert to millimetres x10-6 | 1x10-6mm |