Greatest Common Factor (GCF) of 5, 21 and 28
We here at the Fraction Calculator often determine the Greatest Common Factor (GCF) for numbers such as 5, 21 and 28, because we use the GCF to lower the denominators of our fractions.
The Greatest Common Factor of 5, 21 and 28 is the greatest number (factor) that you can evenly divide 5, 21 and 28 by.
To find the Greatest Common Factor of 5, 21 and 28, we first have to identify all the factors of each number. Then we see which factors they have in common, and finally we pick the largest number they have in common, which is the Greatest Common Factor (GCF) of 5, 21 and 28.
The factors of 5 are 1 and 5. The factors of 21 are 1, 3, 7, and 21. The factors of 28 are 1, 2, 4, 7, 14, and 28. The highest factor they have in common is 1. Therefore, the Greatest Common Factor (GCF) of 5, 21 and 28 is as follows:
GCF(5,21,28) = 1
Greatest Common Factor Calculator
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Greatest Common Factor (GCF) of 5, 21 and 29
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