Factors: 1, 2, 7, 14
Multiples: 14, 28, 42 and so on.
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If you mean the common factors of 14 and 16, they are 1 and 2. The common multiples of 14 and 16 are 112, 224, 336 and so on.
The factors of 7 are 1 and 7. Neither of them are multiples of 42. Put the other way, 7, 14, 21 and 42 are multiples of 7 that are factors of 42.
The factors of 14 are:1, 2, 7, 14The factors of 63 are:1, 3, 7, 9, 21, 63The common factors are:1, 7
28 is a multiple of 14, so it can be proven that any factor of 14 must be a factor of 28.
Factors of the number will also be factors of the number's multiples. Multiples of the number will also be multiples of the number's factors.