Every answer comes with the working, so you can check it or learn it. Add, subtract, multiply and divide fractions and mixed numbers, and convert decimals and percents to fractions. It is free and private.
How to use the fraction calculator
- Choose Calculate or Convert.
- To calculate, type your fractions with an operation between them: Sum, −, × or ÷. Mixed numbers can be entered like 1 1/2.
- Read the answer and the step-by-step working. Press Copy the working to keep it.
- Press AC to clear, or Try one for an example.
Adding and subtracting fractions
Fractions can only be added when their bottom numbers match. The calculator finds the lowest common denominator, rewrites each fraction over it, adds or subtracts the top numbers and then simplifies. Mixed numbers like 1 1/2 are turned into improper fractions first, so 1 1/2 becomes 3/2.
Multiplying and dividing
To multiply, multiply the tops together and the bottoms together. To divide, flip the second fraction upside down and multiply. Each answer is reduced to its simplest form and shown as a mixed number when it is bigger than one.
Repeating decimals
Switch to Convert to turn decimals and percents into fractions. Type a repeating decimal with three dots, like 0.333... or 0.1666..., or put the repeating part in brackets, like 0.1(6). The working shows the classic method: multiply so the repeats line up, subtract, and solve.
Tips for working with fractions
- Always check whether the answer can be simplified. Divide the top and bottom by the same number.
- Turn mixed numbers into improper fractions before multiplying or dividing.
- Estimate first. If you add two halves, the answer should be about one.
- Use the working to find where your own steps differ.
Who uses it
Students checking homework, parents helping with maths, and cooks, builders and crafters who scale recipes and measurements. For harder problems use the equation solver, and for shapes the geometry calculator.
Questions
How do I enter a mixed number?
Type the whole number, a space, then the fraction, such as 1 1/2.
Why is my answer a mixed number?
When an answer is larger than one, it is shown as a mixed number as well as a fraction.
Does it simplify automatically?
Yes. Every answer is reduced to its simplest form.
Is anything sent online?
No. The sums run in your browser.