# Unit

## Key Stage 2

### Meaning

A unit is an amount that we can use to give a number meaning.

Without units a number doesn't mean anything. For example if you ask someone how far away is London and they say '150', that doesn't mean anything. 150 what? 150 camels away? 150 seconds away? 150 metres away? A unit gives the number meaning. Perhaps London is 150 kilometres away.
The units you should know are shown in the following table:
 Measurement Standard Unit Other Units Distance, Length, Width, Height metres millimetres, centimetres, feet, kilometres, miles Time seconds minutes, hours, days, weeks, months, years Temperature degrees Celsius degrees Faranheit Mass kilograms grams Area metres squared centimetres squared Volume metres cubed millilitres, centimetres cubed, litres, millimetres cubed Force, Weight Newtons Pounds, Ounces, Stone Speed metres per second miles per hour, kilometers per hour

## Key Stage 3

### Meaning

Units are quantities that give a number meaning.

Units used in science mean the same thing everywhere. A metre is the same distance everywhere.
Without units a number doesn't mean anything. For example if you ask someone how far away is London and they say '150', that doesn't mean anything. 150 what? 150 camels away? 150 seconds away? 150 metres away? A unit gives the number meaning. Perhaps London is 150 kilometres away.
The units you should know are shown in the following table:
 Measurement Standard Unit Other Units Distance, Length, Width, Height metres millimetres, centimetres, feet, kilometres, miles Time seconds minutes, hours, days, weeks, months, years Temperature degrees Celsius degrees Faranheit Mass kilograms grams Area metres squared centimetres squared Volume metres cubed millilitres, centimetres cubed, litres, millimetres cubed Force, Weight Newtons Pounds, Ounces, Stone Speed metres per second miles per hour, kilometers per hour

## Key Stage 4

### Meaning

Units are quantities that give a number meaning.