Question

Using prime factorization, find HCF and LCM of: 21,22,36,43​

Answer 1

21 is LCM and 36 is the hcf

Answer 2

We can write:

21 = 3 x 7

28 = 2 x 2 x 7 = 2² x 7

36 = 2x2x3x3 = 2² x 3²

45= 3 x 3 x 5 = 32 x 5

HCF (21, 28, 36, 45) = 1

LCM (21, 28, 36, 45)= 2² x 3² x 5 x 7 = 1260