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Cubes and Cube Roots — Maths STD 8 — Question

Maharashtra BoardEnglish MediumSTD 8MathsCubes and Cube Roots1 Mark
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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