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Q: Greatest common factors of 21 and 15?
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What is the greatest common factors of 15 and 21?

The greatest common factor of 15 and 21 is 3The factors of 15 are: 1, 3, 5, 15The factors of 21 are: 1, 3, 7, 21The common factors are: 1, 3The Greatest Common Factor (GCF) is: 3


What is the greatest common factor of 15 21 and 27?

Answer: 3Definition: 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 the numbers have in common.Method: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 15 are 1, 3, 5, and 15.The factors of 21 are 1, 3, 7, and 21.The factors of 27 are 1, 3, 9, and 27.The common factors are 1 and 3. Therefore, the greatest common factor is 3.


What are the common factors and greatest common factor of 21 and 42?

The common factors of 21 and 42 are 3, 7 and 21. The greatest common factor (GCF) is 21.


What is the greatest common factor of 15 and 63?

Factors of 15 are 1, 3, 5, and 15. Factors of 63 are 1, 3, 7, 9, 21, and 63. The greatest common factor of 15 and 63 is 3.


What is the greatest common factor of 21 and 45?

The GCF of 21 and 45 is 3. One way to determine the greatest common factor is to find all the factors of the numbers and compare them. The factors of 21 are 1, 3, 7, and 21. The factors of 45 are 1, 3, 5, 9, 15, and 45. The common factors are 1 and 3. Therefore, the greatest common factor is 3. The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together. The prime factors of 21 are 3 and 7. The prime factors of 45 are 3, 3, and 5. The prime factors in common are a single 3, so the greatest common factor is 3.


What is the greatest common factors of 84 and 105?

The GCF of 84 and 105 is 21.The factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, and 84.The factors of 105 are 1, 3, 5, 7, 15, 21, 35, and 105.The greatest number they have in common (Hint hint, greatest common factor) is 21.


What is the greatest common factor of 15 21 and 28?

The Greatest Common Factor of 15, 21, 28: 1


What are the the greatest common factors of 45 and 15?

The factors of 21 are: 1, 3, 7, 21The factors of 45 are: 1, 3, 5, 9, 15, 45The common factors are: 1, 3The Greatest Common Factor (GCF) is: 3


What is the greatest common factors of 63 and 147?

The greatest common factor of 63 and 147 is 21.


What are the greatest common factors of 21 and 36?

The greatest common factor is 3


How do you get the greatest common factor of 42 to 63 and 105?

The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42 The factors of 63 are: 1, 3, 7, 9, 21, 63 The factors of 105 are: 1, 3, 5, 7, 15, 21, 35, 105 The common factors are: 1, 3, 7, 21 The Greatest Common Factor: GCF = 21


How do you get the greatest common factor of 42 63 105?

The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42 The factors of 63 are: 1, 3, 7, 9, 21, 63 The factors of 105 are: 1, 3, 5, 7, 15, 21, 35, 105 The common factors are: 1, 3, 7, 21 The Greatest Common Factor: GCF = 21