Question

quick techniques to calcute the squares ending with 5

Answer 1

First digit is n and second digit is 5 then in the square of n5 last down digits will be 25 and first two digits will be n(n+1)

for example.square of 25

first digit n= 2
second digit. = 5

so last two digits will be 25

- - 25

now we have to calculate the first two digits n(n+1) = 2(2+1) = 2(3)= 6

so first two digits are 06

0625

so square of 25 is 625.

For example we have 115 ^2

as discussed above last digits are 25

- - 25

first digits are n(n+1) = 11(12) = 132

so square of 115 is 13225

hope it helps you..
Thank you