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4, 8, 12, 16 and 20

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Q: What are the common multiples of 2 and 4 up to 20?
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What are the common multiples of 2 4 5 and 10?

20 pinkgal333:20, 40, 60 are all common multiples.


What is first two common multiples of 2 and 5?

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To find the common multiples of 2, 5, and 9, we first list the multiples of each number. The multiples of 2 are 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ... The multiples of 5 are 5, 10, 15, 20, 25, 30, ... The multiples of 9 are 9, 18, 27, 36, ... The common multiples of 2, 5, and 9 are the numbers that appear in all three lists, which are the multiples of the least common multiple (LCM) of 2, 5, and 9. The LCM of 2, 5, and 9 is 90, so the common multiples are 90, 180, 270, ...


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