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A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that both numbers have in common.
One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them.
The factors of 128 are 1, 2, 4, 8, 16, 32, 64, and 128.
The factors of 245 are 1, 5, 7, 35, 49, and 245.
The only common factor is 1. Therefore, the greatest common factor is 1.
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Earn +20 ptsQ: What is the greatest common factor of 128 and 245?
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Continue Learning about Basic Math
What is the greatest common factor of 1715 and 1225?
The Greatest Common Factor (GCF) is: 245
What is the greatest common factor of 14 and 70?
the greatest common factor of 14 and 70 is 14
What is the greatest common factor of 49 and 245?
7
What is the greatest common factor of 245?
You need at least two numbers to find a GCF.
What is the greatest common factor of 245 and 320?
It's 5. Because 5 divides evenly into both of the numbers.
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