Has it been a long time since you've done simple math? Maybe it's time for some practice. MathDash is the app for you!
MathDash will drill you with arithmetic questions for as long as you want or you can race against the clock to determine your improvement over time.
-ability to choose between addition, subtraction, multiplication, division, and remainder (mod) arithmetic questions.
-ability to choose range of variables in questions.
-play with or with out time limit.