This Problem Set is a part of the Lesson 13, Unit 4, Grade 2. In this lesson, students deepen their understanding of subtraction by understanding the relationship between their drawings and the subtraction algorithm. They use a more abstract chip model, in which place-value disks are replaced by circles or dots to model the subtraction of two-digit numbers. Students record each change they make to their model while simultaneously using the algorithm.
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8 min(s)
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