Question

Find the square of $93$ without multiplication.

Answer 1

Solution: ${93}^2=93\times 93=8649$
To make calculations easy, use the following approach:
$93=(90+3)$
So, ${93}^2=(90+3{)}^2={90}^2+2\times 3\times 90+3^2$
$=8100+2\times 270+9=8649$