(935421 x 625) = ?

Answer: Option B

$$\begin{array}{rl}& 935421\times 625\\ & =935421\times 5^4\\ & =935421\times {\left(\frac{10}{2}\right)}^4\\ & =\frac{935421\times {10}^4}{2^4}\\ & =\frac{9354210000}{16}\\ & =584638125\end{array}$$