Now I could really have made use of this 20 years ago… Mathway is an online problem solver for maths. Simply enter your problem and the service will provide you with a solution (including graphs). It won’t show you the working (this requires the purchase of a software package), but it’s a useful tool to *cough* check your answers.

Areas covered include:

  • Basic Math
  • Pre-Algebra
  • Algebra
  • Trigonometry
  • Pre-Calculus
  • Calculus