Answer: 8
Step-by-step explanation: To determine the greatest common factor between 2 or more digits, you need to first factor out both digits and then compare and see what factors do they have in common.
Factors:
1.) 8x = 1, 2, 4, 8, x
2.) 40y = 1, 2, 4, 5, 8, 10, 20, 40, y
Now we place the common factors in order: In this problem, 8x and 40y share 1, 2, 4, and 8:
3.) 1, 2, 4, 8
4.) The greatest common factor is 8
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