The first fourteen positive integer multiples of 3 are:
1 x 3 = 3
2 x 3 = 6
3 x 3 = 9
4 x 3 = 12
5 x 3 = 15
6 x 3 = 18
7 x 3 = 21
8 x 3 = 24
9 x 3 = 27
10 x 3 = 30
11 x 3 = 33
12 x 3 = 36
13 x 3 = 39
14 x 3 = 42
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14, 28, 42
There are fourteen multiples of seven that are under 100.
The first three multiples of 9 are 9, 18 and 27. For them to be common, they need to be compared to another set of factors.
What are the first three common multiples of four and five
10, 20, 30 The common multiples of 5 and 10 are multiples of their lowest common multiple. The lcm of 5 and 10, is 10. Thus the first three common multiples are 10, 20, 30.