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What are the common factors of 45 and 135?
The common factors of 25 and 45 are: 1 and 5
What are the prime factors of 13 and 30?
13 is a prime factor of itself Prime factors of 30 are: 2, 3 and 5
What is the greatest common factor using prime factorization for 30 and 135?
2 x 3 x 5 = 30 3 x 3 x 3 x 5 = 135 3 x 5 = 15, the GCF
What two numbers have a common factor of 30?
There are not common factors of 30 because there cannot be common factors without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30. The prime factors of 30 are 2, 3, and 5.
What is the greatest common factor of 45 and 55?
The greatest common factor of 45 and 55 is 5 To determine GCF you first find the prime factors of each number. For 45 this is (5, 3, 3). For 55 this is (11, 5). Then you take the product of the prime factors that they have in common. In this case the only prime factor they have in common is 5 so the answer is just 5. For a better illustration of the rule look at 45 and 30. Prime factors of 45 are (5, 3, 3) Prime factors of 30 are (5, 3, 2) The prime factors in common are 5 and 3 and the product of these numbers is 15. Therefore the GCF of 45 and 30 is 15.
