Find step-by-step explanations and practice problems and solutions for Algebra and Calculus. Paul’s Online Math Notes provides very helpful tutorials and lots of sample problems to work through. The site shows step-by-step how to solve problems. It also provides links to “cheat sheets” for Algebra, Trigonometry, Calculus, Limits, Derivatives, Integrals, and Laplace Transforms. There is also a great section on ‘How to Study Math’ and ‘Common Errors in Mathematics’.