How to use the Fraction Calculator
- 1. Type two fractionsUse forms like 3/4, 1 1/2, 2 or 0.25.
- 2. Choose an operationPick add, subtract, multiply or divide.
- 3. See the answerGet lowest terms, a mixed number and a decimal.
How each operation works
- Add: a/b + c/d = (a × d + c × b) ÷ (b × d).
- Subtract: the same, with a minus in the middle.
- Multiply: multiply the tops and multiply the bottoms.
- Divide: flip the second fraction, then multiply.
Then divide the top and bottom by their highest common factor to reach lowest terms.
Worked example
Take 3/4 + 5/6. The top becomes 3 × 6 + 5 × 4 = 38. The bottom becomes 4 × 6 = 24. So the sum is 38/24.
The highest common factor of 38 and 24 is 2, so the answer is 19/12. As a mixed number that is 1 7/12. As a decimal it is about 1.58333333.
Here is a division example: 1 1/2 ÷ 3/4. Turn the mixed number into 3/2, then flip and multiply: 3/2 × 4/3 = 2.
Tips for entering numbers
For a mixed number, put a space between the whole number and the fraction, as in 2 1/4. A minus sign at the front applies to the whole value, so −1 1/2 means −3/2. Decimals are turned into exact fractions, so 0.25 becomes 1/4.
The bottom number cannot be 0, and you cannot divide by a fraction equal to 0. The tool works with whole numbers throughout, so the fraction answer is exact. The decimal is rounded.
Finding a common denominator by hand? The LCM and HCF calculator helps. For longer sums, use the scientific calculator.
Frequently asked questions
How do I type a mixed number?
Leave a space between the whole number and the fraction, like 1 1/2.
Can I mix decimals and fractions?
Yes. A decimal such as 0.25 is turned into an exact fraction first.
Is the answer simplified?
Yes. The answer is always shown in lowest terms.
Is the fraction calculator free?
Yes. You share your name and WhatsApp number once when you see a result. After that, other Uncodemy tools open without the form.