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- Using Laws of Indices
When dealing with calculations involving power of 10 you can use the rules of indices as follows.
a) 10n × 10m = 10n + m
e.g.
(i) 103 × 102 = 103+2 = 105
(ii) 108 × 10-3 = 108+(-3) = 108-3 = 105
b) 10n ÷ 10m = 10n – m
e.g
(i) 105 ÷ 102 = 105-2 = 103
(ii) 10-4 ÷ 10-7 = 10-4 – (-7)
= 10-4+7 = 103
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