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You multiply 6, 7, and 8 until all answers are the same. For example, the common multiples of 3 and 7 would be 21, because:

3,6,9,12,15,18,21

7,14,21

See how they both have the common multiples?

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11y ago
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Wiki User

10y ago

Factor them.

2 x 3 = 6

7

2 x 2 x 2 = 8

Combine the factors, eliminating duplicates.

2 x 2 x 2 x 3 x 7 = 168, the LCM

168, 336, 504 and so on are common multiples of 6, 7 and 8.

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Wiki User

9y ago

They are: 168, 336 and 504

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Anonymous

Lvl 1
3y ago

3,6,9,12,14,16,18,7,14,21

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Q: What is the 3 first common multiple of 6 7 8?
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