Math tools
Calculators that show their work. Use them to check your homework, see where an answer comes from, or find the exact step where you went wrong.
- Fraction calculator Add, subtract, multiply and divide fractions with every step shown and the answer in lowest terms.
- GCF, LCM and prime factorization Breaks numbers into prime factors with a division ladder and finds the greatest common factor and least common multiple.
- Percent calculator Percent of a number, discounts and markups, percent change, and proportions with a missing value.
- Unit converter Length, weight, area, volume, time, speed and temperature, in both US customary and metric units.
- Synthetic division calculator Divides a polynomial by x − c with synthetic division, or finds its rational zeros and factors it completely.
- Quadratic formula calculator Solves ax² + bx + c = 0 using the discriminant, simplifies radicals, and gives the factored form and the vertex.
- Function grapher Plots up to three functions on the coordinate plane. Drag to pan and zoom in on the details.
- Systems of equations solver Solves 2×2 and 3×3 linear systems with Cramer's rule and gives exact fraction answers.
The tools do the arithmetic; the lessons teach the method. Each tool links to the lesson that covers its topic from scratch. Everything runs in your browser, and nothing you type is sent anywhere. Back to the courses.