What are the common multiples of 9 and 79?

Common multiples of 9 and 79 are numbers that both 9 and 79 can be divided into evenly with no remainder.

To find the common multiples of 9 and 79, we compare the list of multiples of 9 with the list of multiples of 79 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 79, we multiply 79 by 1, 79 by 2, and so on like this:

79 x 1 = 79
79 x 2 = 158
79 x 3 = 237
79 x 4 = 316
...

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 79?"

711, 1422, 2133, 2844, etc.

Since 711 is the first number they have in common, 711 is the least common multiple of 9 and 79.

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 711 (the least common multiple), so you can continue the green list above with more common multiples of 9 and 79 by simply adding 711 to the last number on the list.

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What are the common multiples of 9 and 80?
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