5. Mathway.com

This is truly one of the most useful online resources for educational problems. It can answer a massive range of mathematical questions, and it has an interface that makes answering the questions a whole lot easier. It is not like a calculator because it allows you to set out your algebra questions by putting the correct symbols on the screen. It also has a wide number of mathematical settings so that you may have it answer questions with finite math, or pre-algebra.