Question

How to find squares of the numbers lying between 75 to 100?

Answer 1

Using the given example below we can find the square of a number lying between 75 to 100.

We can find ${87}^2$ by using $(a-b{)}^2$
${87}^2=(100-13{)}^2={100}^2+{13}^2-2\times 100\times 13$
$=10000+169-2600$
$=7569$
Or another shortcut method
${87}^2=$
=$100-87=13$
=$87-13/13\times 13$
=$74/169$
=$74+1/69$
=$75/69$
=$7569answer$