Thy are 144 and any of its multiples
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The first three common multiples of 8 and 12 are 24, 48, and 72.
24, 48, 72, 96, 120
The first 2 multiples of 36 are: 36, and 72.The first 2 multiples of 48 are: 48, and 96.
Multiples of 12 are 12, 24, 36, 48, 60, 72, 84... Multiples of 42 are 42, 84... Two common multiples of 12 and 42 are 84 and 168. The Least Common Multiple of 12 and 42 is 84.
Just 72. It was found by multiplying 8 and 9. --------------------------------------- The common multiples of two numbers are the multiples of their lowest common multiple. LCM(8, 9) = 72 The common multiples of 8 and 9 are 72, 144, 216, ... The only common multiples less than 100 are 72 only.