Question

Find the smallest square no. which is divisible by each of the numbers $4,9$ and $10$.

Answer 1

$4=2\times 2$
$9=3\times 3$
$10=2\times 5$
L.C.M = $2^2\times 3^2\times 5=180$

But $180$ is not a perfect square. Multiply 180 with 5 to get pairs.
Required no. $=180\times 5=900$