You need at least two numbers to find a GCF. If that's 4 and 8, the GCF is 4.
5-elevenths of48 = -43
The GCF is 90.
The GCF of 15 and 90 is 15.
The GCF is 5.
If A is a factor of 90, the GCF is A. If A is a multiple of 90, the GCF is 90. If A is co-prime with 90, the GCF is 1.
90 and 180 have a GCF of 90.
The GCF is 9.
The GCF is 1.
The GCF is 2.
The GCF is 5.
The GCF is 10.