This Instructional Activity is a part of the Lesson 15, Unit 3, Grade 7. Make copies of the puzzle at the end of the lesson and cut the puzzle into smaller squares. Mix up the pieces. Give each student a puzzle and tell him to put the pieces together to form a square. When pieces are joined, the problem on one side must be attached to the answer on the other. All problems on the top, bottom, right, and left must line up to the correct graph of the solution.