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Method to find common factors:

Step 1: Find the difference between the two numbers.

52 - 42 = 10.

Step 2: Find the factors of the difference so obtained.

Factors of 10 are 1, 2, 5 and 10.

Step 3: Check with only factors.

1 is factor of every number so, 1 is one of the common factors.

42 and 52 both are even numbers so, 2 is also the common factor.

Numbers ending with the digit either 5 or 0 are only divisible by 5. And the ones ending with only 0 are divisible by 10.

Clearly 42 and 52 are not divisible by 5 and 10.

So, the only common factors of 42 and 52 are 1 and 2.

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11y ago
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14y ago

The common factors of 42 and 105 are: 1, 3, 7, and 21

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7y ago

1 and 3 are the common factors of 21 and 45

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6y ago

The only [non-trivial] common factor of 42 and 50 is 2.

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6y ago

The common factors are: 1, 2

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6y ago

Just 1

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12y ago

1 and 5

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13y ago

1 and 13

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12y ago

1,2,3 and 6

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Q: What are the common factors of 21 and 45?
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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.


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