Final answer:
The greatest common factor of 8, 32, and 40 is 8.
Step-by-step explanation:
The greatest common factor (GCF) of 8, 32, and 40 is 8.
To find the GCF, you can list the factors of each number and identify the largest factor they all have in common.
Factors of 8: 1, 2, 4, 8
Factors of 32: 1, 2, 4, 8, 16, 32
Factors of 40: 1, 2, 4, 5, 8, 10, 20, 40
The largest factor that all three numbers share is 8, so the GCF is 8.