Add, subtract, multiply, and divide fractions with simplified results.
Addition and subtraction use a common denominator (a/b ± c/d = (ad ± cb)/bd). Multiplication multiplies across (ac/bd) and division multiplies by the reciprocal (ad/bc). The result is then reduced to lowest terms by dividing the numerator and denominator by their greatest common divisor.
The questions readers ask most about the fraction calculator.