Do arithmetic with two fractions and get the answer simplified, as a decimal and as a percentage.
The method behind this calculator
Fraction arithmetic follows fixed rules: common denominators for addition and subtraction, straight across for multiplication, and flip-and-multiply for division. The calculator applies them and reduces the result automatically.
For fractions with whole-number parts, the mixed number calculator handles the conversion for you.
How to use it
- Enter the first numerator and denominator.
- Choose the operation.
- Enter the second fraction and read the reduced result.
How the number is calculated
a/b ± c/d = (ad ± cb) ÷ bd
a/b × c/d = ac ÷ bd · a/b ÷ c/d = ad ÷ bc
Worked example
Worked through, a operation of + produces a result of 5/6. Underneath, Decimal comes out at 0.8333 and As percent at 83.33%. Change any field and every figure updates as you type.
FAQ
How do I add fractions with different denominators?
Convert both to a common denominator, add the numerators, then reduce.
How do I divide fractions?
Multiply by the reciprocal of the second fraction — flip it upside down and multiply.