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Fraction Calculators

Add Fractions Calculator

Add two fractions or mixed numbers and get the answer in simplest form, as a mixed number and as a decimal, with every step shown.

Enter values

Results update as you type.

Result

Answer

11/15

Mixed number
11/15
Decimal
0.7(3)
Step-by-stepShow
  1. Least common denominator: LCD(3, 5) = 15
  2. 1/3 = 5/15, 2/5 = 6/15
  3. 5 + 6 = 11 over 15
  4. Simplest form: 11/15

About the Add Fractions Calculator

Add two fractions or mixed numbers and get the answer in simplest form, as a mixed number and as a decimal, with every step shown.

Also known as: add fractions, adding fractions, fraction addition.

How to use this calculator

  1. Enter first fraction, second fraction.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Open “Step-by-step” to see how the answer was worked out.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

a/b + c/d = (ad + bc) / bd

Worked example

Using the values pre-filled in the calculator above:

  • First fraction: 1/3
  • Second fraction: 2/5

the calculator returns:

  • Answer: 11/15
  • Mixed number: 11/15
  • Decimal: 0.7(3)

Working

  1. Least common denominator: LCD(3, 5) = 15
  2. 1/3 = 5/15, 2/5 = 6/15
  3. 5 + 6 = 11 over 15
  4. Simplest form: 11/15