What are the common multiples of 64 and 20?

Common multiples of 64 and 20 are numbers that both 64 and 20 can be divided into evenly with no remainder.

To find the common multiples of 64 and 20, we compare the list of multiples of 64 with the list of multiples of 20 to see what they have in common.

To create a list of multiples of 64, we multiply 64 by 1, 64 by 2, and so on like this:

64 x 1 = 64
64 x 2 = 128
64 x 3 = 192
64 x 4 = 256
...

Similarly, to create a list of multiples of 20, we multiply 20 by 1, 20 by 2, and so on like this:

20 x 1 = 20
20 x 2 = 40
20 x 3 = 60
20 x 4 = 80
...

When we compare the two lists to see what they have in common, we get the answer to "What are the common multiples of 64 and 20?"

320, 640, 960, 1280, etc.

Since 320 is the first number they have in common, 320 is the least common multiple of 64 and 20.

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 320 (the least common multiple), so you can continue the green list above with more common multiples of 64 and 20 by simply adding 320 to the last number on the list.

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What are the common multiples of 64 and 21?
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