Question 3

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waecmaths question: 

Find the product of 0.0409 and 0.0021 leaving your answer in the standard form

Option A: 

$8.6\times {{10}^{-6}}$

Option B: 

$8.6\times {{10}^{-5}}$

Option C: 

$8.6\times {{10}^{4}}$

Option D: 

$8.6\times {{10}^{5}}$

waecmaths solution: 

$4.09\times {{10}^{-2}}\times 2.1\times {{10}^{-3}}=8.589\times {{10}^{-5}}\approx 8.6\times {{10}^{-5}}$

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