GCF - Greatest Common Factor.
The factors (integers that multiply to make) of 49 are 1 * 49, 7 * 7
Factors of 9 are 1 * 9, 3 * 3.
Which factors do both numbers have in common? ... Just 1.
This means the GCF of 49 & 9 is 1. IN fact, it's the ONLY common factor of 49 & 9, not just the greatest.
Try this one on your own:
GCF of 25 and 75.
Hint: Factors of 25 -- 1, 25. 5, 5.
Hint: Factors of 50 -- 1, 50. 2, 25. 5, 10.
Which factors of 25 and 50 are in common?
Of these common factors, which is the greatest? (GCF)
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The GCF is 7.
The GCF (Greatest Common Factor) of 49 and 343 is 49. Since 49 is a factor of 343, it is automatically the GCF.
The GCF is 1.
The GCF is 1.
The GCF is: 1