Fraction Calculators

FractionLab guides

Plain-language answers to fraction calculators questions, written from the same sourced data behind FractionLab. Every guide lists its sources and the date it was last updated.

• Updated June 10, 2026

  How do you convert a fraction to a decimal — and when does it terminate?

  Divide the numerator by the denominator; the decimal terminates only when the reduced denominator's prime factors are 2s and 5s — 3/8 ends, 1/3 repeats.

• Updated June 10, 2026

  How do you add and subtract fractions with different denominators?

  Rewrite both fractions over a common denominator, add or subtract the numerators, then simplify — 1/3 + 1/4 becomes 4/12 + 3/12 = 7/12.