Question

Least common multiple of 7 and 21

Answer 1

21

Explanation:

Since 7 x 3 is 21

And 21 x 1 is 21

Answer 2

21

Explanation:

To find the least common multiple of 7 and 21 , we need to break each number down to its prime factors

7 = 7

21 = 7*3

To find the least common multiple multiply each factor the greatest number of times it occurs in either number.

The LCM = 7*3

= 21