Math
Fraction Calculator
Compare two rational numbers, perform arithmetic, and get the simplified fraction plus decimal equivalent.
Add, subtract, multiply, or divide rational numbers with automatic simplification.
Fraction arithmetic
a⁄b ⊕ c⁄d = (ad ⊕ bc) ⁄ bd
The calculator finds a common denominator, performs the chosen operation, and simplifies the result by dividing numerator and denominator by their greatest common divisor.
How to use
- Enter the numerators and denominators for Fraction A and Fraction B.
- Pick the operation (add, subtract, multiply, divide).
- Review the simplified fraction and decimal approximation in the results panel.
Example
Input: Fraction A = 3/4, Fraction B = 2/5, Operation = Add
Output: Simplified = 23/20, Decimal = 1.15
FAQ & notes
What happens if I enter a zero denominator?
The calculator blocks invalid fractions by marking the result as undefined until both denominators are non-zero.
Does the tool reduce improper fractions?
Yes. Every result is simplified—improper fractions remain improper but are presented in lowest terms alongside a decimal.