4
To calculate the GCF you first have to split the numbers into their prime factors: 28 = 2x2x7 12 = 2x2x3 20 = 2x2x5 The next step is to identify any common factors. In this case, all three numbers have two 2s. Multiply these together and you get 4. Therefore the GCF of 28, 12 and 20 is 4.
The GCF is 14.
The GCF is 4.
GCF(14, 28, 21) = 7
The GCF is 4.
The GCF is 4.
The GCF of 12, 4, and 28 is 4.
The GCF is 4.
GCF(4412, 28) = 4.
The GCF is 4.
The GCF is 4.
4
4
It is: 4
The GCF is 4.
The GCF of 12, 28, and 30 is 2