Question
Find the cube of: $2.1$
✓
Answer
We have: $2.1=\frac{21}{10}$ Also, $\Big(\frac{\text{m}}{\text{n}}\Big)^3=\frac{\text{m}^3}{\text{n}^3}$ $\therefore\Big(\frac{21}{10}\Big)^3$ $=\frac{21^3}{10^3}$ $=\frac{21\times21\times21}{10\times10\times10}$ $=\frac{9261}{1000}$ $=9.261$
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