1 and 5
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Factors of 20: 1, 2, 4, 5, 10, 20Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30Factors of 80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80Common factors of 20, 30, and 80: 1, 2, 5, 10
Oh, dude, the greatest common factor of 50 and 80 is like the biggest number that can divide both of them evenly. So, you look at the factors of 50 (1, 2, 5, 10, 25, 50) and the factors of 80 (1, 2, 4, 8, 16, 40, 80) and the biggest number they have in common is 10. So, the greatest common factor of 50 and 80 is 10. Easy peasy, right?
The greatest common factor of 54 and 80 is 2.
The GCF of 69 and 80 is 1. There are no other common factors.
The common factors are: 1, 2, 4, 8, 16The Greatest Common Factor = 16