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you would have to make a factor tree for 8, 14, and 21. 8 equals 2*2*2. 14 equals 7*2 and 21 equals 7*3. Then you have to see what is the lowest number that they have in common. 8,14,21 do not have a number in commone so there isn't a common multiple.

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13y ago

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The least common multiple of 8 and 21 is 168.

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8y ago
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Since 21 is a multiple of 7, it is automatically the LCM.

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8y ago
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The lowest common multiple of 8 and 21 is 168.

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13y ago
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LCM(7, 21) = 21.

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Wiki User

8y ago
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168

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Wiki User

11y ago
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It is: 21

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8y ago
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Q: What is the least common multiple of 8 14 21?
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