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Proper factors are all the factors of a number except the number itself. To find the factors of a number, start with 1 and list the factor pairs of the number. For example, the factor pairs of 18 are:
1 x 18
2 x 9
3 x 6
The factors of 18 are: 1, 2, 3, 6, 9, 18.
The proper factors are: 1, 2, 3, 6, 9.
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Why is it useful to find the product of prime factors?
Once you have the prime factorization, it is much easier to find the factors, the proper factors, the GCF and LCM.
Do all proper factors have some factors that you can multiply to get another proper factor?
No. Some proper factors are prime.
How do you find a proper factor?
From the list of regular factors, delete one and the number itself.
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.
How do you find the proper factors of 54?
List the factors of 54 without 1 and 542, 3, 6, 9, 18, 27
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.
What are the proper factors for 13?
Prime numbers don't have proper factors.
Proper factors of 31?
Prime numbers don't have proper factors.
