Oh, dude, the greatest common factor of 147 and 245 is 49. It's like when you're trying to find the one thing they both have in common, and it's just 49, you know? So, if you ever need to divide both 147 and 245 by something, 49's got your back.
The GCF is 49.
The GCF is 3.
The GCF is 7.
The GCF is 1.
The GCF is 147.
The GCF is 5.
3 x 7 x 7 = 1475 x 7 x 7 = 2457 x 7 = 49, the GCF
4.5938
735
Since 21 is a factor of 147, it is automatically the GCF.
The GCF is 7.