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One way to determine the common factors 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 40 are 1, 2, 4, 5, 8, 10, 20, and 40.

The common factors are 1 and 5.

The greatest common factor is 5.

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15y ago
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Wiki User

14y ago

The factors of 40 are 1,2,4,5,8,10,20 and 40.

The factors of 15 are 1,3,5 and 15.

So the factors common to both number are 1 and 5

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Q: What are the common factors of 40 and 15?
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What are the common factors of 15, 25 and 40


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The factors of 15 are: 1, 3, 5, 15The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40The common factors are: 1, 5The Greatest Common Factor (GCF) is: 5


What is the greatest common divisor of the numbers 15 and 40?

To find the greatest common factor of two numbers, you first need to break them into their prime factors: 15 = 3x5 40 = 2x2x2x5 The next step is to identify any common factors. In this case, the only common factor is 5. Thus, the greatest common divisor of the numbers 15 and 40 is 5.


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The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30. The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40. The common factors of 30 and 40 are 1, 2, 5, and 10, and the GCF is 10.


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