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Fraction Calculator
Add, subtract, multiply, divide two fractions.
Enter values to see your result
Frequently asked questions
Addition — common denominator?
a/b + c/d = (ad + bc) / bd. Multiply denominators, cross-multiply numerators, add. Calculator also reduces result.
Division — flip second?
Yes. a/b ÷ c/d = a/b × d/c = ad/bc. "Keep-change-flip" mnemonic.
Why simplify?
Canonical form — 6/8 and 3/4 are equal but 3/4 is easier to understand. Calculator auto-simplifies using GCD.
Mixed numbers?
Improper fraction like 7/3 = 2 1/3 (two whole + one-third). Shown when result ≥ 1.