Fraction Calculator
Add, subtract, multiply and divide fractions with the steps shown.
Result
7/12
1/3 + 1/4
Mixed number
7/12
Decimal
0.5833333333
Percentage
58.3333%
Common denominator used
12
1/3 + 1/4 = (1×4 + 1×3) / 12
- The answer is always reduced to lowest terms by dividing through by the greatest common divisor.
What does Fraction Calculator do?
Perform arithmetic on two fractions and get the answer in lowest terms, as a mixed number and as a decimal. The working is shown, including the common denominator used, so it doubles as a study aid.
How to Use Fraction Calculator
- 1Enter the first fractionNumerator and denominator, plus a whole part if mixed.
- 2Choose the operationAdd, subtract, multiply or divide.
- 3Enter the second fractionThe answer appears simplified automatically.
Key Features
- All four operations on proper, improper and mixed fractions
- Answer given simplified, as a mixed number and as a decimal
- Shows the common denominator and the intermediate step
- Exact integer arithmetic, so large numerators never lose precision
- Refuses division by a zero fraction with a clear message
Frequently Asked Questions
How do I add fractions with different denominators?
Convert both to a common denominator, add the numerators, then simplify. 1/3 + 1/4 becomes 4/12 + 3/12 = 7/12. The calculator shows this intermediate step.
How do I divide fractions?
Multiply by the reciprocal — flip the second fraction and multiply. 2/3 ÷ 4/5 becomes 2/3 × 5/4 = 10/12 = 5/6.
What is an improper fraction?
One where the numerator is larger than the denominator, such as 7/4. It can be written as the mixed number 1 3/4. Both forms are shown for every answer.
How are fractions simplified?
By dividing both numerator and denominator by their greatest common divisor, found with the Euclidean algorithm. 18/24 has a GCD of 6, giving 3/4.
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