Question

Find the least number which must be subtracted from 4000 to make it a perfect square ?/also find the square root of the perfect square obtained. ​

Answer 1

Fist we take the lcm of the no and make pairs of the the numbers after that we see 2 and 5 are left. Multiply both of them i.e 2*5 = 10.
Therefore subtract 10 the number will be 4000-10 = 3990. Hence, under root 3990 is 63.something. I hope it helps.