Question

Write down the decimal expansions of : $\frac{13}{1325}$

Answer 1

$\frac{13}{3125}=\frac{13}{5^5}=\frac{13\times 2^5}{5^5\times 2^5}$
=$\frac{13\times 2^5}{{10}^5}=\frac{416}{{10}^5}=0.00416$