Answer:
9
Step-by-step explanation:
all number is divisible by 1,3,9. therefore 1,3,9 is the common factor. GCF 9.
Factors:
27: 1, 3, 9, 27
45: 1, 3, 5, 9, 15, 45
63: 1, 3, 7, 9, 21, 63
90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
Common Factors:
1, 3, and 9
GCF: 9
hope it helps!!
