The GCF/HCF of 11 and 21 is 1.
21 and 80's highest common factor is one.
1 has one factor: itself.11 has two factors: one and itself.
It is: 11
14 and 21, and 21 and 28 are the number pairs between 15 and 30 that have 7 as their greatest common factor.
1 is the only common factor of 11 and 21.
The O'Reilly Factor - 1996 - 2013-11-21 was released on: USA: 21 November 2013
11(2b2 + 21)
The GCF/HCF of 11 and 21 is 1.
Since 11 is a prime number, the only shared positive integer factor of 11 and 21 is 1.
1) You look for a common factor between the two numbers. Prime factorization can help here. 2) You divide both numbers by this factor. Three goes into both 21 and 33. 21 to 33 can be simplified to 7 to 11.
21 and 80's highest common factor is one.
The GCF is 1.
Matt
Between 11 and 21: 12, 14, 15, 16, 18 and 20.
21 is not a prime factor, it is 3 x 7
16