Divide :

0.1575 ÷ 0.21

We have:

$\dfrac{0.1575}{0.21} = \dfrac{0.1575 \times 100}{0.21 \times 100} = \dfrac{15.75}{21}$

On dividing 15.75 by 21, we get:

$\begin{array}{r} 0.75 \ 21 \overline{\smash{)} 15.75 } \ \underline{147\phantom{0}} \ 105 \ \underline{105} \ 0 \phantom{.} \end{array}$

Hence, $\dfrac{0.1575}{0.21} = \dfrac{15.75}{21} = 0.75$