How to use the Fraction Calculator
Enter two fractions such as 1/2 and 1/3, or mixed numbers, choose add, subtract, multiply or divide, and read the simplified answer with its decimal value.
Adding and subtracting
To add fractions, give them the same denominator first. For 1/2 + 1/3, use 6: that makes 3/6 + 2/6 = 5/6. Subtraction works the same way. The calculator finds a common denominator for you and reduces the answer to lowest terms.
Multiplying and dividing
To multiply, multiply the tops and the bottoms: 2/3 × 3/4 = 6/12, which simplifies to 1/2. To divide, flip the second fraction and multiply, so 3/4 ÷ 1/2 becomes 3/4 × 2/1 = 3/2, or 1 1/2 as a mixed number.
The formula
a/b + c/d = (ad + bc) ÷ bd, then reduce by the greatest common divisor
Examples
- 1/2 + 1/3
Answer: 5/6 Decimal: 0.8(3)
- 3/4 − 1/6
Answer: 7/12 Decimal: 0.58(3)
- 2/3 × 3/5
Answer: 2/5 Decimal: 0.4
Limitations and assumptions
Computed in your browser with standard double-precision arithmetic unless the page says otherwise. Very large or very small values may be rounded.
Frequently asked questions
How do I add fractions with different denominators?
Find a common denominator (the LCM of the denominators), convert each fraction and add the numerators.
How do I divide fractions?
Multiply by the reciprocal of the second fraction.
How is the result simplified?
Numerator and denominator are divided by their greatest common divisor.
Can I turn the result into a decimal?
Yes, or use the fraction to decimal calculator.