Question

How to Calculate Square Root

Answer 1

Unit Digits of Squares
First we need to remember unitdigits of all squares from 1 to 10. The figure below shows the unit digits of the squares.

Now from the picture we can say that, whenever the unit digit of a number is 9, unit digit of the square root of that number will be definitely 3 or 7. Similarly, this can be applied to other numbers with different unit digits

Answer 2

1.divide ur number into perfect square factor:
ex : the factors of 8 are 2 and 4
2×4=8
thus the perfect square root of 400
25×16=400


$\sqrt{400}$
$= \sqrt{25 \times 16}$
$= \sqrt{25} \times \sqrt{16}$

$= 5 \times 4$
$= 20$


example 2.

$\sqrt{147}$
$= \sqrt{49 \times 3}$
$= \sqrt{49} \times \sqrt{3}$
$= 7 \sqrt{3}$