Find the cubes of :
(i) 2.1
(ii) 0.4

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Solution

(i) (2.1)³ = $\frac{(21 \times 21 \times 21)}{(10 \times 10 \times 10)} = \frac{9261}{1000} = 9.261$
(ii) (0.4)³ = $\frac{4 \times 4 \times 4}{10 \times 10 \times 10} = \frac{64}{1000} = 0.064$

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Find the cubes of:

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2 \frac{2}{5}

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Find the surface area of a cube whose edge is
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