Addition Facts (0-10) 50 Problems in 5 minutes Timed Test Students need repetition to help them remember their basic math facts, but do you know what works even better? Competition! Students who get 48 out of 50 right get to move to the next "level," which is 50 Subtraction Facts (0-10). What's nice about this is that after the first "practice test," they are competing at their own level.