Math Playground - Let’s get fluent in our math facts. Challenge yourself to the one minute timed test of your choice. Keep track of your scores and see for yourself how one minute a day can make a HUGE difference. You can practice addition facts to 20, subtraction facts to 20, mixed addition and subtraction facts to 20, addition facts to 100, subtraction to 100, mixed addition and subtraction to 100, multiplication facts and division facts.