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The gcf of 20 and 30 means the greatest common factor. You can do this my dividing 20 and 30 by the same number.
Eventually, you will get 10, no other number is greater than 10.
20/10 = 2 and 30/10 = 3.
So your answer will be 10.
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What is the GCF of 20 an 30?
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