Your result
How this calculation works
Add/subtract using a common denominator. Multiply numerators and denominators. Divide by multiplying by the reciprocal. Reduce by the greatest common divisor.
Enter whole-number numerators and nonzero denominators. Results are reduced to simplest form, with a decimal equivalent.
How to use this calculator
- Enter or choose first numerator.
- Enter or choose first denominator.
- Enter or choose operation.
- Enter or choose second numerator.
- Enter or choose second denominator.
- Select Calculate and review the result and assumptions.
Worked example
1/2 + 1/3 = 5/6, approximately 0.833333.
Assumptions and limitations
Each entered integer must have an absolute value no greater than 1,000,000. Division by a zero fraction is undefined.
Frequently asked questions
Can a denominator be negative?
Yes. The result is normalized so its denominator is positive.
Why are denominators not allowed to be zero?
Division by zero does not define a fraction.