The GCF is 1.
GCF(14, 28, 21) = 7
The GCF is 7.
The GCF of 9 and 21 is 3.
The GCF is 3.
GCF(28, 21) = 7 Steps: Prime factorization of the numbers: 28 = 2 × 2 × 7 21 = 3 × 7 GCF(28, 21) = 7
You need at least two numbers to find a GCF.For example:The GCF of 21 and 9 = 3The GCF of 21 and 28 = 7
The GCF is 7.
The GCF is 1.
The GCF is 7.
The GCF of 9 and 21 is 3.
The GCF is 7.
The GCF is 3. The LCM is 63.