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To find the LCM of two or more numbers you can list the multiples of the numbers until you find one that is common to all.

7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 105, 112, 119, 126

9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108, 117, 126,

2, 4, 6, 8, 10, 12, 14, 16, 18, 30...126

You don't need to list all the multiples of 2 because 126 is the LCM of 7 and 9, so 126 has to be the LCM of 2 and the other two numbers.

The LCM of 7, 9, and 2 is 126.

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11y ago

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