\[{20}^{2}\times \frac{{10}^{2}}{\sqrt{625}}\]

1
Since 25×25=62525\times 25=625, the square root of 625625 is 2525.
202×10225{20}^{2}\times \frac{{10}^{2}}{25}

2
Simplify  202{20}^{2}  to  400400.
400×10225400\times \frac{{10}^{2}}{25}

3
Use this rule: a×bc=abca \times \frac{b}{c}=\frac{ab}{c}.
400×10225\frac{400\times {10}^{2}}{25}

Done

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