Factors: 1 and 13
Multiples: 13, 26, 39 and so on.
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Factors: 1, 2, 4, 8, 13, 26, 52, 104 Multiples: 104, 208, 312 and so on.
Factors: 1, 2, 3, 6, 13, 26, 39, 78 Multiples: 78, 156, 234 and so on.
It is always useful to know about factors and multiples.
Multiples of 13 include 13, 26, 39 and so on. For them to be common, they need to be compared to another set of multiples.
Factors go into numbers, numbers go into multiples.