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Greatest Common Factor Calculator

A factor of a number is a whole number that divides evenly into the number evenly without a remainder. Factoring a number means finding its factors. A prime number is a number that has no factors except 1 and itself. A prime factor is a number that divides evenly into the number and is a prime number.

The greatest common factor (GCF) of two or more numbers is the biggest factor that they have in common. In other words, the highest number that divides evenly into all the numbers. Factoring numbers is neccessary when performing mathematical operations using fractions.

To find the greatest common factor of a group of two or three numbers, enter the numbers into the boxes below. If you want to find the GCF of only two numbers, leave the third box empty.

Find Greatest Common Factor
    First Number:
Second Number:
    Third Number:
Greatest Common Factor (GCF):

This script and many more are available free online at The JavaScript Source

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