Objective: Share and critique peer strategies for adding two-digit numbers.
During Lesson 18, students share and critique strategies for adding two-digit numbers. They bring to bear all of the strategies used thus far in the module, including arrow notation, quick tens, and number bonds. Projecting two correct work samples, students compare for clarity, discussing questions such as: Which drawing best shows the tens? Which drawings best help you not count all? Which number sentence is easiest to relate to the drawing?
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