Find the least square number which is exactly divisible by 10. 12, 15, and 18.
Sol. L.C.M. of 10, 12, 15, 18 = 180
Now , 180 = 2 x 2 x 3 x 3 x 5
= `2^2 xx 3^2 xx 5`
To make it a perfect square ,it must be multiplied by 5.
`:.` Required number = `(2^2 xx 3^2 xx 5^2)` = 900.
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