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Q: Why is 7 the prime factor of 28 and 63?

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7 is a factor of 28 because 4 x 7 equals 28. 7 is a factor of 63 because 9 x 7 = 63. That makes 7 a common factor of 28 and 63. The factors of 28 that are larger than 7 are 14 and 28. The factors of 63 that are larger than 7 are 9, 21 and 63. Since none of those numbers are the same, that makes 7 the greatest common factor of 28 and 63.

The GCF is 7.

The GCF of 28, 35 and 63 is 7.

7

The GCF is 7.

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7

It is: 7

7 is a factor of 28 because 4 x 7 equals 28. 7 is a factor of 63 because 9 x 7 = 63. That makes 7 a common factor of 28 and 63. The factors of 28 that are larger than 7 are 14 and 28. The factors of 63 that are larger than 7 are 9, 21 and 63. Since none of those numbers are the same, that makes 7 the greatest common factor of 28 and 63.

The GCF of 28 and 63 is 7.

The greatest prime factor of 40 is 5. The greatest prime factor of 63 is 7. They do not have any prime factors in common.

1, 3, 7, 9, 21, 63 3 and 7 are prime.

It is 7 because the product of its prime factors are: 3*3*7 = 63

The Greatest Common Factor of 28, 42, 63: 7

As a product of its prime factors: 3*3*7 = 63

7 since 7 goes into 63 and 140 evenly and 7 is a prime.

The GCF is 7.

The greatest common factor of the numbers 28, 35 and 63 is 7.

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