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Question

hcf and lcm of 20 and 30

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Solution

Prime factorisation of 20 = 2×2×5
And prime factorisation of 30 = 2×3×5
So H.C.F of 20 and 30 = 2×5 = 10
And L.C.M of 20 and 30 is given by;
2 20, 305 10, 15 2, 3
Therefore L.C.M of 20 and 30 = 2×5×2×3 = 60

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