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Q.
What is the least perfect square exactly divisible by each of the numbers $6,9,15$ and 20 ?
Squares and Square Roots and Cubes and Cube Roots
Solution:
L.C.M. of $\left(6,9,15\right.$ and 20) $=180=2^2 \times 3^2 \times 5$
So to make it a perfect square we have to multiply it by 5 .
$\therefore$ Least perfect square $=2^2 \times 3^2 \times 5^2$
Exactly divisible by 6, 9, 15 and $20=900$