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The factors of 35 are 1, 5, 7, and 35.

The factors of 81 are 1, 3, 9, 27, and 81.

The only factor they have in common is 1. Therefore, 1 is the greatest common factor. This means that 35 and 81 are relatively prime.

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

The prime factors of 35 are 5 and 7.

The prime factors of 81 are 3, 3, 3, and 3.

They have no prime factors in common, so they are relatively prime, which means the only factor they have in common is 1.

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Q: What is the greatest common factor of 35 and 81?
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