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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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Q: What are the proper factors of 40?
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What are proper factors?

Factors are the numbers that evenly divide into a given number.Proper factors are all the factors of the number except the number itself. Some definitions do not allow the number 1, either. If you distinguish between proper factors and proper divisors, proper factors do not include 1, but proper divisors do.Examples:All factors of 54 are 1, 2, 3, 6, 9, 18, 27, and 54.Proper factors of 54 are 2, 3, 6, 9, 18, and 27.Proper divisors of 54 are 1, 2, 3, 6, 9, 18, and 27.All factors of 9 are 1, 3, and 9.Proper factors of 9 are only 3.Proper divisors of 9 are 1 and 3.All factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30.Proper factors of 30 are 2, 3, 5, 6, 10, and 15.Proper divisors of 30 are 1, 2, 3, 5, 6, 10, and 15.All factors of 100 are 1, 2, 4, 5, 10, 20, 25, 50, and 100.Proper factors of 100 are 2, 4, 5, 10, 20, 25, and 50.Proper divisors of 100 are 1, 2, 4, 5, 10, 20, 25, and 50.All factors of 120 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, and 120.Proper factors of 120 are 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, and 60.Proper divisors of 120 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, and 60.


How many factors does 40 have?

40,=1,2,4,5,8,10,20 AND 40


What is 40 over 803 in simplest form?

Since neither 40 or 803 have any common factors other than one, the proper fraction 40/803 is already expressed in its simplest form.


Do all proper factors have some factors that you can multiply to get another proper factor?

No. Some proper factors are prime.


Does three have proper factors?

No, no prime number has proper factors.


What are the proper factors for the number 1?

One has no proper factors.


What are proper factors for 1?

1 doesn't have proper factors.


What is the proper factors of 320?

2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160


What are the factors of 40 and 50?

The factors for 40 are 1,2,4,5,8,10,20,40 The factors for 50 are 1,2,5,10,25,50


What are the proper factors for 7?

Prime numbers don't have proper factors.


What are the proper factors of 89?

Prime numbers don't have proper factors.


What are the proper factors of 22?

The proper factors of 22 are 2 and 11.