Question

Find the least perfect square number exactly divisible by each

one of the numbers 4, 5, 10.

Answer 1

As 10 is divisible by 10 so we will focus on 4 and 10.....

$10 ^{2} = 100$
$4 {}^{2} = 16$

As 100 is divisible by all, 4,5 and 10 so the ans is 100