Question 1

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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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