The GCF is 5.
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The GCF is 35.
The GCF is 7.
The GCF of 45 and 80 is 5. Prime factors: 45 = 5x3x3 80 = 5x2x2x2x2 the only prime factor in both is 5, and so the highest common factor is 5. Alternative method: 80 mod 45 = 35 45 mod 35 = 10 35 mod 10 = 5 10 mod 5 = 0 so HCF = 5.
The GCF of 42 and 35 is 7.factors of 42: 2,6,7factors of 35: 5,7
The GCF is 35.