Question

Find the LCM of the given pairs of numbers using prime factors.
a. 21 and 9
b. 27 and 36​

Answer 1

Given:

a. 21 and 9

b. 27 and 36

To find:

LCM

Solution:

a.

21= 3× 7

9= 3× 3

LCM= 3× 3× 7

= 3× 21

= 63

b.

27 = 3× 3 × 3

36 = 3× 3 × 4

LCM = 3× 3 × 3 × 4

= 9 × 12

= 108