The GCF is 1.
150 30:60,90,120,150,180... 75:150...
It's difficult to determine if you want that to be one set or five. Taken as a whole, the GCF is 1. Individually... The GCF of 25 and 75 is 25. The GCF of 18 and 30 is 2. The GCF of 4 and 10 is 2. The GCF of 12 and 17 is 1. The GCF of 30 and 96 is 6.
The GCF is 15.
The GCF is 15.
The LCM of 30 and 75 is 150. Their GCF is 15.
The GCF is 15.
The GCF is 3.
GCF(36, 36, 75) = 3.
The GCF of 30 and 75 is 15
The GCF is 5.
The GCF is 3.
The GCF is 15.