A free program for Android, by wz game.

What’s Math Quiz?

Math Quiz is a free educational game that aims to improve your math skills and train your brain. It includes addition, subtraction, multiplication, and division in its puzzles, as well as an expository and root-finding section. It also has an extensive list of mathematical functions and formulas.

It’s pretty easy. You start by choosing a difficulty level, which determines how hard the puzzles will be. Just choose your answer from the 4 choices and see if you answered correctly. You may use the diamonds to buy 20 more seconds if your time is used up.