The factors of 16 are 2, 4 and 8. The factors of 36 are 2, 4, 9, 12 and 18. The common factors are therefore 2 and 4. The common prime factor is 2.
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16 factors to [2 2 2 2] 36 factors to [2 2 3 3] 48 factors to [2 2 2 2 3] Common factors = [2 2] =4 ■
The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, 36. Thus the multiples of 2 which are not factors of 36 are: 8, 10, 14, 16, 20, 22, 24, 26, 28, 30, 32, 34, 38, 40, 42, ... (all multiples of 2 greater than 36 are not factors of 36).
36 + 16 = 52
16
4, 12 and 36 are the multiples of 4 that are also factors of 36