Common multiple of 21 and 24?

Answer 1

The lowest multiple of 21 and 24 can be figured by first factoring the numbers and multiplying the unique factors together.

21 = 3 x 7

24 = 2 x 2 x 2 x 3

Unique factors are 2, 3, 7, 8

2 x 3 x 7 x 8 = 168

168 / 21 = 8

168 / 24 = 7

Since these both divided evenly, the correct answer is 168.

Answer 2

504 but you probably want the least common multiple.

That would be: 168

Answer 3

168, 336, 504 and so on.