The GCF of 90 and 189 is 9.
The GCF is 9.
The GCF is 9.
You need at least two numbers to find a GCF.
The GCF is 27.
The GCF is 63.
The GCF is 27.
The GCF is 1.
The GCF of 81 and 189 is 27.
The GCF of 27 and 189 is 27.
The GCF is 27.
GCF(105, 145, 189) = 1: the three are coprime.