1, (59 is a Prime number)
The GCF is 1.
The factors of 59 are: 1, 59 The factors of 81 are: 1, 3, 9, 27, 81
The GCF is 1.
The GCF is 1.
The GCF is 1.
You need at least two numbers to find a GCF. If that's 55 and 9, or 5 and 59, their GCFs are both 1.
The GCF is 1.
The GCF is 1.
The GCF is: 1
The GCF is 1.
The GCF is 1.
The GCF of 21 and 59 is 1.