(Study Materials) Numerical Ability/Quantitative Aptitude :
Square Root & Cube Root
The square root of a number is that number the product of which itself gives
the given number, ie, the square root of 400 is 20, the square root of 625 is
The process of finding the square root is called evaluation. The square root
of a number is denoted by the symbol called the radical sign.
How to Find the Square Root of an Integer?
(i) By the method of Prime Factors: When a given number is a perfect square,
we resolve it into prime factors and take the product of prime factors, choosing
one out of every two.
(ii) By the method of Long Division: This method can be used when the number
is large and the factors cannot be determined easily. This method can also be
used when we want to add a least number or to subtract a least number from a
given number so that the resulting number may give a perfect square of some