waecmaths question:
Simplify 0.000215 × 0.000028 and express your answer in standard form
Option A:
6.03 x 109
Option B:
6.02 x 109
Option C:
6.03 x 10-9
Option D:
6.02 x 10-9
waecmaths solution:
$\begin{align} & 0.000215\times 0.000028=2.15\times {{10}^{-4}}\times 2.8\times {{10}^{-5}} \\ & =6.02\times {{10}^{-9}} \end{align}$
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