Find the least perfect square exactly divisible by each one of the numbers 4, 5, 10.
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=> First let us find the lcm of 4,5 and 10
=>4 = 2*2
=>5 = 5*1
=>10 = 2*5
=>lcm = 2*2*5 (they are the prime factors
=>.20
20 is the lcm of 4 , 5 and 10
Now multiply the prime factors so that all the prime factors will have even multiplicities.
=> the prime factors was2*2*5
=>2² *5
>now
=>2 ² * 5²
=>4 *25
=> 100
∴100 is the answer
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