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**janette diaz****Member**- Registered: 2008-09-08
- Posts: 1

My daughter have a homework of inter-math . she was on 6 grade and I dont understand this: Why is the set of factors of a number not the same as the set of proper factors of that number? Explain and give example.

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,630

The "proper factors" are the factors other than the number itself. Sometimes 1 is also excluded.

Factors of 12: 1,2,3,4,6,12

Proper Factors of 12: 1,2,3,4,6

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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**JaneFairfax****Member**- Registered: 2007-02-23
- Posts: 6,868

MathsIsFun wrote:

Sometimes 1 is also excluded.

Sometimes 1 is called the trivial factor.

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