That looks like homework do it yourself. We are only allowed to give hints to things like this. So to find The Greatest Common Factor (GCF) of some numbers, is the largest number that divides evenly into all of the numbers. Like, the GCF of 27 and 63:
27: 1, 3, 9, 27
63: 1, 3, 7, 9, 21, 63
17) GCF= 9
21) GCF=12
22) LCM = 189
