Add, subtract, multiply, or divide two fractions, with the answer simplified and shown as a decimal. Enter the fractions and an operation.
Usage Tip
To add fractions fast, the common denominator is at most the product of the two denominators; simplifying at the end keeps the numbers small.
Multiply: numerators and denominators straight across
Divide: multiply by the reciprocal of the second
The result is reduced to lowest terms.
The answer is simplified and also shown as a decimal and a mixed number.
A denominator of zero is undefined.
To add or subtract fractions, convert them to a common denominator first, then combine the numerators. To multiply, multiply the numerators together and the denominators together. To divide, flip the second fraction and multiply. The result is simplified by dividing the top and bottom by their greatest common factor.
For example, one half plus one third is three sixths plus two sixths, which equals five sixths. The decimal value is shown next to the fraction so you can see the size at a glance. Dividing by a fraction with a zero numerator, or using a zero denominator, is undefined. Fractions are exact, which makes them useful in woodworking, cooking, and any measurement where rounding would add up.