All multiples of 36 are multiples of 18.
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They are: 36 and 72
For 9: 9, 18, 27, 36 and so on. For 12: 12, 24, 36, 48 and so on. For 18: 18, 36, 54, 72 and so on. Common multiples include, 36, 72, 108, 144 and so on.
The common multiples of 6 and 9 are the infinite set of multiples of their LCM, which is 18. So the common multiples of 6 and 9 are 18, 36, 54, 72, 90, 108, 126, 144, 162, 180, and so on.
Oh, what a happy little question! When we talk about multiples, we're looking at numbers that both 2 and 9 can be divided into evenly. The common multiples of 2 and 9 are numbers like 18, 36, 54, and so on - just like little friends skipping along together in the meadow.
Since 36 is a multiple of 12, all of its multiples are common.