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A factor is a number that can be divided into the given number withno remainder. The factors of 12 are 1 and 12, 2 and 6, 3 and 4.

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 ...

www.mathsisfun.com/definitions/proper-factor.html

Illustrated definition of Proper Factor: Any of the factors of a number, except 1 or the number itself. All positive factors of 12: 1,2,3,4,6,12 Proper...

mathworld.wolfram.com/ProperFactor.html

A proper factor of a positive integer n is a factor of n other than 1 or n (Derbyshire 2004, p. 32). For example, 2 and 3 are positive proper factors of 6, but 1 and 6 are not. Compare with the term proper divisor, which means a factor of n other than n (but including 1).

mathforum.org/library/drmath/view/55784.html

The reason I am asking is that I am taking a Survey of Mathematics class and it has some examples where 1 is considered a proper factor. Specifically my book says that the proper factors of 8 are 1, 2, and 4. In a question I found on your site for the proper factors of 12, someone said that the proper factors would be 2, 3, 4, and 6.

www.gcflcm.com/gcf-of-12-and-20

Greatest common factor (GCF) of 12 and 20 is 4.. GCF(12,20) = 4. We will now calculate the prime factors of 12 and 20, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 12 and 20.

www.calculatorsoup.com/calculators/math/factors.php

The Factoring Calculator finds the factors and factor pairs of a positive or negative number. Enter an integer number to find its factors. For positive integers the calculator will only present the positive factors because that is the normally accepted answer.

36.what-are-the-factors.com

What Are the Factors of 36? The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, 36. Here is how you calculate the factors of 36. First, every number is divisible by ...

www.reference.com/math/proper-factors-2d428687f2f00ba9

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.

www.mathsisfun.com/numbers/factors-all-tool.html

No Fractions! Factors are usually positive or negative whole numbers (no fractions), so ½ × 24 = 12 is not listed.. Calculator. This calculator will find all the factors of a number (not just the prime factors).It works on numbers up to 4,294,967,295. Try it and see.

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