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To find the LCM of 28 and 5 you start by splitting these into their prime factors:

28 = 2x2x7

5 = 5

The next step would be to identify any common factors. In this case, there are none, and so we take all the factors, and multiply them together to find the LCM:

2x2x7x5 = 140

Thus the LCM of 28 and 5 is 140.

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13y ago

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