Adding Fractions Calculator
Add two fractions quickly and see the full step-by-step process including common denominator calculation.
How to Add Fractions
Adding fractions requires a common denominator. Our tool finds the Least Common Denominator (LCD) for you and shows every step of the conversion and addition process.
Like Denominators
a/c + b/c = (a+b)/cJust add the numerators
Unlike Denominators
a/b + c/d = (ad + bc) / bdFind common denominator first
Examples
Add 1/2 + 1/3
1LCD of 2 and 3 is 6
2Convert: 3/6 + 2/6
3Add: (3+2)/6 = 5/6
Frequently Asked Questions
What is the LCD?
The Least Common Denominator is the smallest number that both denominators can divide into evenly.
Do I add the denominators?
No! You only add the numerators (the top numbers) once the denominators are the same.