Since 36 is a multiple of 12, it is automatically the LCM, but if you insist...
2 x 2 x 3 = 12
2 x 2 x 3 x 3 = 36
2 x 2 x 3 x 3 = 36, the LCM
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The LCM of the given two numbers is 48
Two or more numbers are normally needed to find the LCM
5 2 x 2 x 3 = 12 2 x 2 x 3 x 5 = 60, the LCM
Well, honey, the least common multiple of 2, 12, and 16 is 48. You take the highest power of each prime number that appears in the factorization of each number, and then multiply them all together. Voilà, you've got your answer!
If it's the lowest Common Multiple (LCM) of 12, 20, 24 and 32 that you're after, I think it's 480 (but my maths is a little rusty)