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GCF Calculator

Find the greatest common factor

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Fraction 1

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Fraction 2

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The Greatest Common Factor (GCF), also called Greatest Common Divisor (GCD), is the largest positive integer that divides both numbers without a remainder. It is used to simplify fractions and solve equations.

Fun Fact

Euclid's algorithm for the GCF, published in "Elements" around 300 BC, is one of the oldest algorithms still in everyday use.

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