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Q: What s the greatest factor of -7 and 21?

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The greatest common factor of 21 and 99 is 3. 21's factors are 1,3,and 7 99's factors are 1,3,9,11 33 (there may be more factors of 99). The highest factor that both number have in common are 3.

It is 1

the greatest common factor of 6 an 21 is 3 because 6's factors are 1,2, 3and 6 and 21's is 1,3,7, and 21. So the greatest one of those is 3.Yo its 3 :D

If you mean the greatest prime factor of 210 it is 7.

63 and 84's highest common factor is 21.

The factors of 7 are 1, 7 The factors of 25 are 1, 5, 25 → The common factor(s) of 7 and 25 is (are): 1 → greatest common factor is 1.

Seven and 245's highest common factor is seven.

The GCF is 7.

1, 3, 7, 9, 21, 63.

The factors of 21 are 1, 3, 7, and 21. The only factor of 21 that is a composite number is 21.

1, 2, 3, 6, 7, 14, 21, 42

There is neither a greatest common factor nor common factors of a single number, such as 72, because there cannot be any form of 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. Thus, since there are not two or more numbers to compare, there are neither common factors nor a greatest common factor.The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72.The prime factors of 72 are 2, 2, 2, 3, and 3.Examples:The common factors of 21 and 72 are 1 and 3; the greatest common factor is 3.The common factors of 56 and 72 are 1, 2, 4, and 8; the greatest common factor is 8.The common factors of 72 and 100 are 1, 2, and 4;the greatest common factor i s 4.MoreThe question has a problem, because a greatest common factor is a factor "common" to two or more numbers. A single number has no "common" factor.An example of greatest common factor:Find the greatest common factor of 49 and 21.- The factors of 49 are 1, 7, and 49.- The factors of 21 are 1, 3, 7, and 21.The greatest factor common to both numbers is 7.

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