This App is a math-practice tool that comes in two steps: (1) Prepare yourself in "Exercise" Section, which eventually reveals the correct answers - mostly by examples - then (2) Take a test in "Take a Test" Section to see the results of your practice. This App is all about what are equal and what are not. The purpose is for you to avoid extremely common mistakes people make when they take some of the first year college mathematics courses.
The App shows the importance of parentheses, how the cancellation works in fractions, and how radical notations work.