1, 2, 4, 5, 8, 10, 20, 40.
Technically, that's correct, but proper factors are the factors of a number EXCEPT the number itself. So, the PROPER FACTORS of 40 would be 1, 2, 4, 5, 8, 10, and 20.
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40,=1,2,4,5,8,10,20 AND 40
The factors for 40 are 1,2,4,5,8,10,20,40 The factors for 50 are 1,2,5,10,25,50
The factors of 40 are 1,2,4,5,8,10,20 and 40. For them to be common, they need to be compared to another set of factors.
Factors of 16: 2 4 8 Factors of 40: 2 4 5 8 10 20
You might be thinking of proper factors. Proper factors are just like the set of regular factors, except for 1 and the number itself.