This document teaches you how to convert a unit from one with prefix to one without, vice versa, There is also a practice for you to assess your own understanding.
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How to convert Units?
Step 1 – Memorise the prefix table! (Sorry, no short cut for this.)
Prefix
Abbreviatio
n
Factor
Nano
n
10-9
Micro
µ
10-6
Milli
m
10-3
Centi
c
10-2
Deci
d
10-1
Kilo
k
103
Mega
M
106
Giga
G
109
Step 2A – If you are asked to change a unit with a prefix into one
without,
multiply the number with the factor of the prefix.
E.g.1
E.g. 2
400 mg = …………….g
↓
400 x 10-3 g = 0.4 g
0.025 km = …………. m
↓
0.025 x 103 m = 25 m
Step 2B – If you are asked to change a unit without prefix into one
with prefix,
divide the number with the factor of the
prefix.
E.g.3
3.9 m = ……………. cm
3.9 ÷ 10-2 = 390 cm
E.g. 4
5000 Hz = …………. MHz
5000 ÷ 106 = 0.005 MHz
Fold along the dotted line to cover the answer. After trying the questions,
unfold the page to mark your work.
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