Q:
# What are proper factors?

**Proper factors are factors of a number N that are neither N nor 1.** In general, a factor of N is a whole number, or integer, that divides N without a remainder.

For example, the factors of 20 are 1, 2, 4, 5, 10 and 20. The proper factors of 20 are 2, 4, 5 and 10. Usually, when factoring a number, it is desirable to report only the prime factors, or factors that are also prime numbers. The prime factorization of 20 excludes 4 and 10, because both of these numbers are divisible by 2, and 10 is also divisible by 5.

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Q:
## How do you factor polynomials with four terms?

A: A four-term polynomial is most often factored by grouping, a process where terms that have common factors are grouped and factored separately. In some case... Full Answer >Filed Under: -
Q:
## What are the factors of 26?

A: The factors of 26 are one, two, 13 and 26. One and the number itself, in this case 26, are always factors. Since 26 is an even number, which means that it ... Full Answer >Filed Under: -
Q:
## What are the factors of 21?

A: The factors of 21 are 1, 3, 7 and 21. A factor is a number that can divide evenly into a given number. Because 21 can be divided by numbers other than itse... Full Answer >Filed Under: -
Q:
## What are the factors of 78?

A: The factors of 78 are 1, 2, 3, 6, 13, 26, 39 and 78. The factors of a number are found by breaking the number down into all the combinations of positive in... Full Answer >Filed Under: