Formula and example
How it is calculated
a/b + c/d = (a·d + c·b)/(b·d). Divide numerator and denominator by their GCD to simplify.
Worked example
1/3 + 1/6 = 2/6 + 1/6 = 3/6 = 1/2. The decimal value is 0.5.
Things to check
- Numerators and denominators are whole numbers. A negative denominator is converted to a sign on the numerator.
- The fraction uses exact integer arithmetic; the decimal display is rounded.
Frequently asked questions
Why is a common denominator shown?
It shows how the inputs are expressed on the same basis for addition and subtraction. For multiplication and division, it is additional information.