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Q: What factor of 21 is a prime factor?

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no

3 is a prime factor of 12 and of 21.

21 3,7

21 is not a prime factor, it is 3 x 7

It is 3 that is a common prime factor to both numbers

3 and 7

3

No, 14 and 21 are not relatively prime. They share the factor 7.No.

No. The only factors of a prime number are 1 and itself. The only way that 21 could be a factor of a prime number is if it were a prime number, but it is not because 21 is also divisible by 3 and 7.

No. 21 is not a factor of 182. The prime factorization of 182 is 21 x 71 x 131.

3

3

3 and 7

It is 3

3x7=21 3 and 7 are prime numbers, so 3x7 is the factor tree of the number 21.

The factors are: 1, 3, 7, 21 The prime factors are: 3, 7

the greatest common factor of 8 21 and 75 is 1.

21 = 3 x 7 both 3 and 7 are prime numbers

1, 3 and 7

3

No, they are not. They share 3 as a factor.

No, they are not. They share 3 as a factor.

prime factor = prime number which can be divided into the given number with no remainder The prime factors of 21 are 3 and 7.

Its factors are: 1 3 7 and 21 Note that 3 and 7 are prime numbers

Yes, 4 and 21 are relatively prime. Numbers that are relatively prime only have the number 1 as a common factor. That is the case with 4 and 21.