Question

4. Find the LCM and HCF of 6 and 20 by
the prime factorisation method​

Answer 1

Answer:

LCM of 6 and 20

6 = 2 x 3 x 1

20 = 2 x 2 x 5 x 1

LCM of 6 and 20 = 2 x 2 x 3 x 5 x 1 = 60

HCF of 6 and 20

6 = 2 x 3 x 1

20 = 2 x 2 x 3 x 5 x 1

6 and 20 have only 2 common factors that is 1 and 2.

Clearly 1 < 2 so the HCF of 6 and 20 is 2.