There is an infinite number of common multiples for 12 and 20. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
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The GCF is 4.
20 pinkgal333:20, 40, 60 are all common multiples.
15 & 20 have an infinite number of Common Multiples; the first three are 60, 120 and 180.
20
20, 40, 60, 80 and so on.