Sum
3/4
Decimal: 0.750000
Learn more
How this calculator works and what to know before using it
What this calculator does
Adds, subtracts, multiplies, divides, or simplifies fractions and mixed numbers.
How to use it
- Choose an operation.
- Enter whole number (optional), numerator, and denominator for each fraction.
- View the simplified result and decimal equivalent.
Formula used
Fraction arithmetic
a/b ± c/d = (ad ± bc)/bd · a/b × c/d = ac/bd · a/b ÷ c/d = ad/bc · simplify with GCD
Source. Addition and subtraction use a common denominator. Multiplication multiplies numerators and denominators. Division multiplies by the reciprocal. The result is reduced by the greatest common divisor.
Updated November 1, 2026
Example
1/2 + 1/4 = 3/4 (0.75). Mixed number 2 1/3 = 7/3.
Good to know
- Results are automatically reduced to lowest terms.
- Division by zero is not allowed.
Common questions
- How do I add fractions with different denominators?
- Find a common denominator (or cross-multiply), add numerators, keep the denominator, then simplify. Example: 1/3 + 1/6 = 2/6 + 1/6 = 3/6 = 1/2.
- How do I convert a mixed number to an improper fraction?
- Multiply whole number by denominator, add numerator, place over denominator. Example: 2 1/4 → (2×4+1)/4 = 9/4.
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