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9 = 3 x 3
First, write both numbers as the product of their prime factors: 9 = 3x3 12 = 2x2x3 The next step is to identify any common prime factors. In this case, both numbers have 3 as a prime factor. Therefore, the HCF of 9 and 12 is 3.
The prime factorization of 9 is 32 You need at least two numbers to find a GCF.
9 times 9=2*8+51 the factor is 3
72 = 8 x 9 = 23 x 32