7 is prime; it is only divisible by 1 and itself.
6 is divisible by 1, 2, 3 and 6.
The only factor common to both is 1.
The Greatest Common Factor (GCF) is: 1
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The greatest common factor of 7 and 30 is 1.
GCF of 5, 6, and 7 is 1.Factors of 5: 1, 5Factors of 6: 1, 2, 3, 6Factors of 7: 1, 7Factors common to all three: only the 1The GCF of 5, 6, and 7 is, therefore, 1.Note: If two numbers are only one digit apart, such as 5 and 6, their greatest common factor is 1. If three numbers are each one digit apart, such as 5, 6, and 7, their greatest common factor is 1. The greatest common factor cannot be larger than the difference between the numbers, so if the difference is 1, the greatest common factor is 1.
Since 7 is a factor of 28, it is automatically the GCF of 7 and 28The Greatest Common Factor (GCF) of 28 and 7 is 7.
The greatest common factor of 28 and 49 is 7.
There is not a greatest common factor of 42 because there cannot be a greatest 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. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. The prime factors of 42 are 2, 3, and 7. Examples: The greatest common factor of 36 and 42 is 6. The greatest common factor of 42 and 91 is 7. The greatest common factor of 42 and 375 is 3.