About this calculator
Negative fractions are fine; enter the minus sign on the numerator.
How to use it
- Enter the first fraction.
- Choose the operation.
- Enter the second fraction.
The formula
a/b + c/d = (ad + bc)/bd; a/b × c/d = ac/bd; a/b ÷ c/d = ad/bc
- simplest form
- numerator and denominator divided by their GCD
Worked example
3/4 + 5/6
- = (3 × 6 + 5 × 4) / 24 = 38/24.
- Simplified: 19/12 = 1 7/12 ≈ 1.583.
What the result means
Dividing by a fraction is the same as multiplying by its reciprocal.
Assumptions
- Whole-number numerators and denominators.
Limitations
- Denominators cannot be zero.
Frequently asked questions
How do I add fractions?
Use a common denominator: a/b + c/d = (ad + bc) ÷ bd, then simplify.
What is a mixed number?
A whole number and a fraction, such as 1 7/12.
How do I divide fractions?
Flip the second fraction and multiply.
Last reviewed on 3 October 2026. Found a mistake? Tell us.