Oh, dude, the greatest common factor of 135 and 315 is 45. It's like the biggest number that both 135 and 315 can be divided by without leaving a remainder. So yeah, 45 is the GCF, but like, who really cares, right?
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The prime factorization of 30 is 2 x 3 x 5. You need at least two numbers to find a GCF.
315 = 32 x 5 x 7525 = 3 x 5 x 73 x 5 x 7 = 105 (GCF)
The greatest common factor of 315 and 225 is 45.
The GCF is 63.
The greatest common factor of 63 and 135 is 9.
The GCF is 35.