Teachers, save “Basic Facts List 4 - Subtraction” to assign it to your class.

教師備註 (學生不可見)

Each list gets progressively harder. I allow the students to solve independently and work out the answers the first time then if they get higher than 80% correct I speed test them on the same list (I do 2 minutes) If they still get higher than 80% I move them to the next list.