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18 and 81 share only one prime factor: 3

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Q: Common prime factors 18 81
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What is the greatest common factor of 37 and 81?

The factors of 37 are 1 and 37. The factors of 81 are 1, 3, 9, 27, and 81. They have only one factor in common - 1. Since the greatest common factor of 37 and 81 is 1, they are relatively prime. You can also look at the prime factors to determine the greatest common factor. 37 is a prime number, so its only prime factor is itself, 37. 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 their greatest common factor is 1.


What are the common factors of 81?

The factors of 81 are 1, 3, 9, 27 and 81. For them to be common, they need to be compared to another set of factors.


What is the greatest common factor of 18 27 and 81?

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 18 are 1, 2, 3, 6, 9, and 18. The factors of 27 are 1, 3, 9, and 27. The factors of 81 are 1, 3, 9, 27, and 81. The common factors are 1, 3, and 9. Therefore, the greatest common factor is 9.


What is the LCM of 81 and 64?

The LCM is 5184. The numbers 81 and 64 have no common factors. When you have two relatively prime numbers, you find their LCM by multiplying them. So 5184 is 81x64.


What are the common factors of 81 108 and 162?

The common factors of 81, 108, and 162 are: 1, 3, 9, and 27