Square root in just 5 second

How we can find the squre root of number whose last digit is '5' ?

Find square root '1455'

STEP 1 :

First we will split the given square root from the last digit which is '5'.
like this :

VALUE ONE : 145 and VALUE TWO : 5


STEP 2 :

Now we will take VALUE ONE and Multiply it with its successor value like given below:

VALUE ONE : 145 and SUCCESSOR VALUE : 146
Multiply both the value : 21170


STEP 3 :

Now we will take VALUE TWO and Multiply it with '5':
Then we will get VALUE TWO : 25

Now concatinate or join both values and we will get the final value = 2117025