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Factors of 18: 1, 2, 3, 6, 9, 18

Factors of 20: 1, 2, 4, 5, 10, 20

GCF (18, 20) = 2

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Q: What are the greatest common factors of 18 and 20?
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What is the greatest common factor between 10 and 18 and 32?

The GCF of 18, 20, and 32 is 2. Factors of 18... 1,2,3,6,9 & 18 Factors of 20... 1,2,4,5,10 & 20 Factors of 32... 1,2,4,8,16 & 32... Therefore the GCF would be 2 !


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The GCF of 18 and 20 is 2. The prime factors of 18 are 3, 3, 2 The prime factors of 20 are 5, 2, 2, The Greatest Common Factor is the highest factor that goes into both numbers, so the GCF is 2.


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The Greatest Common Factor of 18, 13, and 20 is 1.


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The Greatest Common Factor of 20 and 90 is 10, because the factors of 20 are: 20:1,2,4,5,10,20 The factors of 90 are: 90:1,2,3,5,6,9,10,15,18,30,45,90 So, the common factors are 1,2,5,10 10 is the greatest number of them so 10 is the Greatest Common Factor. THE ANSWER IS 10


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