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promptContainer.studentInstructions
Click 
Read the subtraction question.
Select your answer by clicking on it 
Submit your work 
promptContainer.teacherNotes
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.
