What are the common multiples of 43 and 20?

Common multiples of 43 and 20 are numbers that both 43 and 20 can be divided into evenly with no remainder.

To find the common multiples of 43 and 20, we compare the list of multiples of 43 with the list of multiples of 20 to see what they have in common.

To create a list of multiples of 43, we multiply 43 by 1, 43 by 2, and so on like this:

43 x 1 = 43
43 x 2 = 86
43 x 3 = 129
43 x 4 = 172
...

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 43 and 20?"

860, 1720, 2580, 3440, etc.

Since 860 is the first number they have in common, 860 is the least common multiple of 43 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 860 (the least common multiple), so you can continue the green list above with more common multiples of 43 and 20 by simply adding 860 to the last number on the list.

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What are the common multiples of 43 and 21?
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