Fraction Calculator
Add, subtract, multiply or divide two fractions, auto-reduced.
How it works
a/b ± c/d = (a·d ± c·b) ÷ (b·d), then divide by the GCD
Denominators cannot be 0. The result is reduced to lowest terms with a decimal approximation.
Worked example
1/2 + 1/3: common denominator gives 3/6 + 2/6 = 5/6 ≈ 0.833.
2/3 × 3/4 = 6/12 = 1/2; 1/2 ÷ 3/4 = 1/2 × 4/3 = 2/3.
Notes and limitations
Addition and subtraction need a common denominator; multiplication and division do not. Division is "multiply by the reciprocal". Reduce results; the denominator cannot be zero. In mixed expressions: brackets, then × ÷, then + −.