They are members of the infinite set of numbers of the form 28*k where k is an integer.
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Multiples of 3 are 3, 6, 9 and so on. Multiples of 7 are 7, 14, 21 and so on. The common multiples of 3 and 7 include 21, 42, 63 and so on.
Multiples of 6 are even composite numbers.
The multiples of 2 are the even numbers.
Even multiples of 5 must end with a zero.
what multiples do 7,5 and 9 have that are the same