Fraction Calculator โ Add, Subtract, Multiply & Divide Fractions
Perform arithmetic with fractions instantly. Add, subtract, multiply, and divide fractions with step-by-step simplification. Results are automatically reduced to lowest terms using the greatest common divisor (GCD) algorithm.
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To add or subtract fractions, you need a common denominator โ the LCM of both denominators To multiply fractions, multiply numerators together and denominators together To divide fractions, multiply by the reciprocal of the divisor Euclid's GCD algorithm (c. 300 BC) is still the standard method for simplifying fractions A fraction is in lowest terms when GCD(numerator, denominator) = 1
Ready to run the numbers?
Why: Fractions are one of the most important and most challenging topics in elementary and middle-school mathematics. Research shows that a student's understanding of fractions in 5th grade is the strongest predictor of their success in algebra and higher math. Fractions appear everywhere: cooking recipes (ยพ cup), construction (โ -inch bolt), music (time signatures like 3/4), and probability.
How: Enter two fractions by specifying their numerators and denominators. Choose an operation (add, subtract, multiply, or divide), and the calculator finds the result, automatically simplifying to lowest terms using Euclid's GCD algorithm. The step-by-step solution shows how the common denominator is found, how numerators are combined, and how the result is reduced.
Run the calculator when you are ready.
Result
How to Use This Calculator
- Select the operation you want to perform (addition, subtraction, multiplication, or division).
- Enter the numerator and denominator for the first fraction.
- Enter the numerator and denominator for the second fraction.
- The calculator will automatically display the result in simplified form.
- If the result is an improper fraction (numerator larger than denominator), it will be displayed as a mixed number.
Fraction Tips
Simplifying Fractions
To simplify a fraction, find the greatest common divisor (GCD) of the numerator and denominator, then divide both by the GCD.
Converting to Decimals
To convert a fraction to a decimal, divide the numerator by the denominator.
Finding Common Denominators
The least common multiple (LCM) of the denominators is the smallest number that both denominators divide into evenly.
Equivalent Fractions
Multiply both the numerator and denominator by the same non-zero number to create an equivalent fraction.
For educational and informational purposes only. Verify with a qualified professional.
๐งฎ Fascinating Math Facts
Ancient Egyptians only used unit fractions (1/n). They wrote 2/5 as 1/3 + 1/15 โ a system documented in the Rhind Papyrus (~1650 BC).
โ Britannica
Euclid's algorithm for finding GCD, used to simplify fractions, is one of the oldest algorithms still in widespread use โ dating to around 300 BC.
โ Wolfram MathWorld
Musical time signatures are fractions: 3/4 time means 3 quarter-note beats per measure. Pythagoras discovered that harmonious intervals correspond to simple fraction ratios.
โ Grove Music Online
The fraction 355/113 approximates ฯ to 6 decimal places (3.1415929...) โ the best rational approximation with a denominator under 1000.
โ Wolfram MathWorld
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