How it works
- Adding or subtracting: rewrite both fractions over the lowest common denominator, then add or subtract the numerators.
- Multiplying: multiply the numerators together and the denominators together.
- Dividing: flip the second fraction (its reciprocal) and multiply.
- Finally, divide the top and bottom by their greatest common factor to simplify.
Frequently asked questions
How do I enter a mixed number like 1 1/2?
Convert it to an improper fraction first: multiply the whole number by the denominator and add the numerator. 1 1/2 becomes 3/2.
Can I use negative fractions?
Yes. Put the minus sign on the numerator, for example −3 over 4.
Why can’t the denominator be 0?
A fraction is a division, and dividing by zero has no answer.
Results are estimates for general information and are not financial, medical or professional advice.