Because 7 is not a factor of 15 and 30 (is is though of 35).
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7 is not the greatest common factor (GCF) of 15, 30, and 35 because 7 does not evenly divide into all three numbers. The GCF is the largest number that can divide all three numbers without leaving a remainder, and in this case, the GCF is actually 5 since 5 divides evenly into all three numbers.
The GCF of 42 and 35 is 7.factors of 42: 2,6,7factors of 35: 5,7
The GCF is 7.
The GCF is 7.
Factors of 35: 1, 5, 7, and 35Factors of 30: 1, 2, 3, 5, 6, 10, 15, and 30Common factors: 1 and 5Greatest common factor: 5
The GCF of 49 and 35 is 7.