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14 21 28
-16
Multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, and so on. Multiples of 5 are 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, adn so on. The common multiples of 3 and 5 are all of the multiples of 15, i.e. 15, 30, 45, 60, 75, 90, and so on.
Factors of 21 = 1, 3, 7, 21 Multiples of 21: 21, 42, 63, 84, 105, 126, 147 +21 . . .
30, 60, 90 and so on. Multiples of 30.