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Prime factorization of 18 = 2 x 3 x 3
Prime factorization of 45 = 3 x 3 x 5
Prime factorization of 63 = 3 x 3 x 7
It can be seen that 3 x 3 is the greatest number common in the factorization of 18, 45 and 63.
So, GCF is 3 x 3 = 9.
Wiki User
∙ 11y ago
Wiki User
∙ 7y agoThe GCF of 18, 45, and 63 is 9
18=2*3*3
45=3*3*5
63=3*3*7
3*3=9
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