12, 24, and 48 are all multiples of 12 and factors of 48.
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The greatest (or highest) common factor is the highest number that divides exactly into two or more numbers. 36: 1, 2, 3, 4, 6, 9, 12, 18, 36 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 The GCF for 36 and 48 is 12.
5 is not.
(n - 4)(n - 12)
4 and 12
Each number is half the previous number.