What are the common multiples of 9 and 18?

Common multiples of 9 and 18 are numbers that both 9 and 18 can be divided into evenly with no remainder.

To find the common multiples of 9 and 18, we compare the list of multiples of 9 with the list of multiples of 18 to see what they have in common.

To create a list of multiples of 9, we multiply 9 by 1, 9 by 2, and so on like this:

9 x 1 = 9
9 x 2 = 18
9 x 3 = 27
9 x 4 = 36
...

Similarly, to create a list of multiples of 18, we multiply 18 by 1, 18 by 2, and so on like this:

18 x 1 = 18
18 x 2 = 36
18 x 3 = 54
18 x 4 = 72
...

When we compare the two lists to see what they have in common, we get the answer to "What are the common multiples of 9 and 18?"

18, 36, 54, 72, etc.

Since 18 is the first number they have in common, 18 is the least common multiple of 9 and 18.

Note: Our lists are shortened because they go on forever, but can you see the pattern when you look at the answer in green above? The common multiples are in intervals of 18 (the least common multiple), so you can continue the green list above with more common multiples of 9 and 18 by simply adding 18 to the last number on the list.

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