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The GCF of 18 and 45 is 9.
The prime factors of 18 are 2, 3 and 3
The prime factors of 45 are 3, 3 and 5
Only the two 3s are common to both numbers, so the highest common factor will be 3 x 3 = 9
It is 9
The GCF of 18 and 45 is 9. The common factors of both numbers are 1, 4, and 9.
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