GCSE Maths

Measurement: Prefixes


There are many other prefixes, with milli (m) being the other one you're likely to need. e.g. 1,000 mm = 1 m.

The milli is a slightly confusing prefix, as when used with the metre, each m stands for something different! Other prefixes that you might meet in maths or science are listed below:

PrefixMultiplierPower of ten
giga, G1,000,000,000 (billion)109
mega, M1,000,000 (million)106
kilo, k1,000 (thousand)103
deci, d1/10 (tenth)10-2
centi, c1/100 (hundredth)10-2
milli, m1/1,000 (thousandth)10-3
micro, µ1/1,000,000 (millionth)10-6
nano, n1/1,000,000,000 (billionth)10-9

Make sure you know at least the ones in red.

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