Objective: Solve and share strategies for adding two-digit numbers with varied sums.
Students share their preferred strategies in Lesson 19, explaining the reason they choose to use a particular strategy for a particular set of addends. Students discuss questions such as, “In which number bonds do you see an easier problem to solve? Is there another way to solve this problem? How are [the selected student]’s methods different from or the same as your partner’s?
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