Question

Find the square root of 12.5 correct to one decimal place.

Answer 1

12.5 can also be written as = 1250/100

square root of 1250/100 = (25root2)/10 = 2.5root2

and if you want the answer without root then root2 value is 1.414

so 2.5 * 1.414 = 3.535 is the square root of 12.5 that is 3.5 round off

Answer 2

Square root of 12.5=3.57
So,
The last place digit became 1 and added to the second last number
12.5=3.56


Hope it will help you