How can you find the greatest common multiple of 12 24 and 30?

Answer 1

There is no greatest common multiple: for whatever value you say is the greatest I can always add their lowest common multiple and get an even greater common multiple.

There is a greatest common FACTOR and a LOWEST common multiple:

gcf(12, 24, 30) = 6

lcm(12, 24, 30) = 120

Using the factorisation method:

12 = 2^2 x 3

24 = 2^3 x 3

30 = 2 x 3 x 5

hcf = 2 x 3 = 6

lcm = 2^3 x 3 x 5 = 120