Measurement of Length and Motion
Writing lengths
Learn how to write a length with its unit.
A length is always written as a number and a unit together. Your book gives some rules for writing units the right way.
Small letters. Unit names (kilometre, metre, centimetre, millimetre) begin with a small letter, except at the start of a sentence. Their symbols (km, m, cm, mm) are always small letters.
No 's' for more than one. Write 3 km, not 3 kms; 20 cm, not 20 cms.
No full stop after a symbol, unless it ends the sentence.
A space between the number and the unit. Write 15 cm, not 15cm.
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