Complete guide: Fractions
Updated:
Adding or subtracting fractions with different denominators requires finding a common denominator; multiplying is direct (numerator times numerator, denominator times denominator) and dividing means multiplying by the flipped fraction. This calculator does all of that for you and simplifies the result.
The result is shown in three forms: simplified fraction (dividing numerator and denominator by their greatest common divisor), mixed number when the fraction is improper (for example 7/4 = 1 3/4) and its decimal equivalent for quick comparisons.
It is ideal for schoolwork, cooking recipes, woodworking and any measurement expressed in fractions. Remember the denominator can never be zero.
How it works
- 1Enter the numerator and denominator of each fraction.
- 2Choose the operation: add, subtract, multiply or divide.
- 3We show the simplified, mixed and decimal result.
Frequently asked questions
How do you add fractions with different denominators?
Cross-multiply: a/b + c/d = (a×d + c×b) ÷ (b×d), then simplify.
How do you divide fractions?
Multiply the first by the reciprocal of the second: a/b ÷ c/d = (a×d) ÷ (b×c).
What is a mixed number?
It is an improper fraction written as a whole number plus a fraction: 7/4 = 1 3/4.