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140, 280, 420

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Q: What are the first three common multiples of 7 20?
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What are three common multiples of 15 and 20?

15 & 20 have an infinite number of Common Multiples; the first three are 60, 120 and 180.


What is the first three common multiples of 5 and 10?

10, 20, 30 The common multiples of 5 and 10 are multiples of their lowest common multiple. The lcm of 5 and 10, is 10. Thus the first three common multiples are 10, 20, 30.


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20 is the smallest common multiple of 4, 5, and 10, and thus the first. Thus, the first three common multiples of 4, 5, and 10 are 20, 40 and 60.


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What are the first three common multiples of four and ten?

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What are the first three common multiples of four and five?

20, 40, 60.


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What are the first three common multiples of 7 and 20?

140, 280, 420