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The GCF of 15 and 23 is 1 because 23 is a prime and has no factors other than 1 and itself. 1, they have no common factors except 1

Using Euclid's Algorithm

23=(15)(1) + 8 =>

15=(8)(1)+7 =>

8=(7)(1)+1 =>

7=(1)(7)

Thus the highest common factor of 15 and 23 is 1.

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7y ago
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7y ago

It is not possible to give a sensible answer to this question. The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!

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Q: What is the greatest common factor of 15 and 23?
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Continue Learning about Basic Math

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What are the common factors and greatest common factor of 23?

Short answer: There are none.There is neither a greatest common factor nor common factors of a single number, such as 23, because there cannot be any form of common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The greatest common factor is the largest factor that all the numbers being compared have in common. Thus, since there are not two or more numbers to compare, there are neither common factors nor a greatest common factor.Examples:The common factors of 23 and 25 are only 1; the greatest common factor is 1.The common factors of 23 and 69 are 1 and 23; the greatest common factor is 23.The common factors of 23 and 75 are only 1; the greatest common factor is 1.The factors of 23 are 1 and 23. For them to be common, they need to be compared to another set of factors.


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What is the greatest common factor of 5 and 23?

Because both numbers are prime numbers, the only common factor they have is 1. Therefore, the greatest common factor is 1. Another way to determine the greatest common factor is to find all the factors of the numbers and compare them. The factors of 5 are 1 and 5. The factors of 23 are 1 and 23. The only common factor is 1. Therefore, the greatest common factor is 1, which means the numbers are relatively prime. The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together. The prime factor of 5 is 5. The prime factor of 23 is 23. There are no prime factors in common, so the numbers are relatively prime, which means the greatest common factor is 1.

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