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What is a prime number for 12 and 21?
3 is a prime factor of 12 and of 21.
What is a prime factor of 12 and 21?
3
What prime number is a factor of 12 and 21?
3
What number is a prime factor of both 12 and 21?
'3' 3 x 4 = 12 3 x 7 = 21 NB '7' is also a prime number.
What factor of 21 is a prime factor?
21 = 3 x 7. Both these factors are prime.
Is 12 a prime factor?
12 isn't a prime factor, since it has 2, 3, 4, & 6 to multiply.
Is 21 a prime factor?
no
What is the greatest common factor for 12 21 30?
The prime factors are: 12 = 2 * 2 *3 21 = 3 *7 30 = 2 * 3 * 5 So the greatest common factor is 3.
What prime number is a factor of 12 and 27?
The prime factors of 12 are 2 and 3. The only prime factor of 27 is 3. The prime number that both 12 and 27 have as a factor is 3.
What is the composite number between 20 and 50 whose prime factor is 21?
21 is not a prime factor, it is 3 x 7
What makes two or more numbers relatively prime?
Two numbers are relatively prime if the only factor they have in common is 1. Example: 12 and 17 are relatively prime because they have only 1 as a common factor. 12 and 21 are not relatively prime because they have 1 and 3 as common factors.
Is 21 a factor of a prime number?
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.
