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All multiples of 72 are greater than 21. If you're looking for factors of 72, use 9 and 12 or 18 and 3

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Q: What multiples of 72 can be added to get 21?
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What are the least common multiples of 72 and 21?

The least common multiple of the numbers 72 and 21 is 504.


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20*3 = 60 < 62 and 215 < 216 = 72*3 So there are 72 - 21 = 51 multiples.


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