Adding Fractions Calculator
Add two fractions or mixed numbers, with the common denominator and the answer simplified and as a mixed number.
Change the values and press Calculate to work out your own figures.
Enter two fractions (a whole-number part is optional).
Show the working
- Common denominator: 12
- 4/12 + 3/12 = 7/12
- Simplify: 7/12
How to use it
Enter two fractions (a whole-number part is optional).
Numbers can be whole numbers, decimals (0.75), fractions (3/4), mixed numbers (1 1/2), repeating decimals (0.(3)) and, where a percent is asked for, percentages (75%). Show the working gives each step.
Key facts
a/b + c/d = (ad + bc) ÷ bd
Common denominators
Rewrite both fractions over their least common denominator, add the numerators, then simplify.
Questions
What is 1/3 + 1/4?
7/12.
What is 1 2/3 + 2 3/4?
4 5/12.
Formulas
a/b + c/d = (ad + bc) ÷ bd
Sources
Limitations
- Numbers have at most 120 digits.