Objective: Recognize and make use of part–whole relationships within tape diagrams when solving a variety of problem types. (Day 2)
During these lessons, students share their strategies for drawing when a part is unknown. For example, when given the problem, “Maria has 15 playing cards in her hand. She has 8 black cards. If the rest are red, how many red cards does she have?” In order to solve this, some students may draw all 15 cards first and then place a box around the 8 black cards Maria already has. Other students will draw the 8 black cards and then count on as they draw to 15. Still other students will label 15 for the total, draw one part labeled 8, and then work towards identifying the missing part. Students will continue to work on recognizing what kind of unknown they are looking for: a part or a total.
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