Fraction Calculator

Add, subtract, multiply and divide fractions and mixed numbers, and see every step: common denominators, cross-cancelling and simplifying to lowest terms. Type a problem like 7/12 + 5/18 and get a full walkthrough.

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How the Fraction Calculator works

  1. Find a common denominator when adding or subtracting, using the LCM of the denominators.
  2. Multiply across for products, or flip the second fraction and multiply for division.
  3. Simplify by dividing top and bottom by their greatest common factor.

Frequently asked questions

How do you add fractions with different denominators?

Rewrite each fraction with the same denominator (the LCM of the two), add the numerators, keep the denominator, then simplify.

How do you divide fractions?

Keep the first fraction, flip the second one (take its reciprocal) and multiply. Then simplify the result.

More Arithmetic & Number Sense calculators

Percentage CalculatorPercent-of, percent change, increase, decrease and reverse percentages. Ratio & Proportion CalculatorSimplify ratios, solve proportions and share amounts in a ratio. GCF and LCM CalculatorCommon factors and multiples using prime factorization. Prime FactorizationBreak any number into primes and test divisibility. Exponents & RootsPowers, square roots, cube roots, radicals and scientific notation. Order of Operations (BODMAS)Evaluate expressions in the correct order, one operation at a time.

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