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Telling the difference between two numbers is one of the most difficult skills primary students have to master.
This activity is for students who need lots of practice with the procedure. It can be used for instruction or independent center work. It would also work well as a walk-about-and-answer activity. You can make this a sorting activity or a basic task card activity. Physically sorting the cards into groups according to the difference will help struggling students really see the meaning of the concept.