Question

55 square without actual multiplication

Answer 1

as last digit is 5 and tens digit is 5 so add 1to the tens digit 5 it becomes 6 now multiply 5 by 6 it is 30 and square of 5 =25

So,55^2=3025

otherwise use the identity (a+b)^2=a^2+2ab+b^2

where a=50 and b=5

so, (50+5)^2=50^2+2×50×5+5^2

=2500+500+25

=3025