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To find the LCM you first have to break 28 and 3 down into their prime factors:

28 = 2x2x7

3 = 3

The next step would be to identify any common factors. In this case, there are none, so we just take every prime factor and multiply them together:

2x2x7x3 = 84

Thus the LCM of 28 and 3 is 84.

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13y ago

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