Question

5. Find the LCM and HCF of the following by prime factorisation

ii) 20, 25, 36
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Answer 1

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900

Steps

The prime factors of 20 are 2 and 5.

The prime factor of 25 is 5.

The prime factors of 36 are 2 and 3.

The least common multiple is the product of all factors in the greatest number of their occurrence.

LCM = 2 x 2 x 3 x 2 x 5 x 2

The least common multiple of 20, 25 and 36 is 900.

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Answer 2

Answer

900

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