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One way to determine the greatest common factor is to find all the factors of the numbers and compare them.

The factors of 49 are 1, 7, and 49.

The factors of 70 are 1, 2, 5, 7, 10, 14, 35, and 70.

The common factors are 1 and 7. Therefore, the greatest common factor is 7.

The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together.

The prime factors of 49 are 7 and 7.

The prime factors of 70 are 2, 5, and 7.

The common prime factors are a single 7, so the greatest common factor is 7.
The GCF is 7.
The GCF is: 7

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Q: What is the greatest common factor of 49 and 70?
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