Question

Find an easy method to complete squares of number ending in 5

Answer 1

We can easily multiply the number ending in 5 . For eg

45 × 45

first we will multiply the unit digit i.e.

5 × 5 = 25

And now we will multiply the tens place digit with its successor

4 × 5 = 20

So answer is 2025

I have solved two more sums in the image.