Square_Math

Here is a simple logic for the squares of the numbers ending with 5.

05*05=025----->0*1 5²

15*15=225------>1*2 5²

25*25=625------>2*3 5²

35*35=1225----->3*4 5²

similarly for all numbers ending with 5,simply multiply the digits before 5 with its preceding number.

For ex:-

Take 115........its square is just 11*12 followed by 25

i.e. 13225.