Question

Find the smallest perfect square number that is divisible by each of the numbers 4, 9 and 10.

Answer 1

$4=2\times 2$
$9=3\times 3$
$10=2\times 5$
The least common number which is divisible by 4,9,10 is the LCM(4,9,10) = $2\times \times 2\times 3\times 3\times 5$ = 180