Question

Find the cube of  1.5 .

Answer 1

We have:  \[1 . 5 = \frac{15}{10}\]

Also,

\[\left( \frac{m}{n} \right)^3 = \frac{m^3}{n^3}\]

∴  \[\left( \frac{15}{10} \right)^3 = \frac{{15}^3}{{10}^3} = \frac{15 \times 15 \times 15}{10 \times 10 \times 10} = \frac{3375}{1000} = 3 . 375\]