1.

LCM of following using division method (15,20)

Answer»

Prime factorization of 15 and 20 is (3 × 5) = 31 × 51 and (2 × 2 × 5) = 22 × 51 respectively. LCM of 15 and 20 can be obtained by multiplying prime factors raised to their respective highest power, i.e. 22 × 31 × 51 = 60.
Hence, the LCM of 15 and 20 by prime factorization is 60.



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