To regroup or not to regroup

This task presents an incomplete problem and asks students to choose numbers to subtract (subtrahends) so that the resulting problem requires different types of regrouping. This way students have to recognize the pattern and not just follow a memorized algorithm--in other words, they have to think about what happens in the subtraction process when we regroup. This task is appropriate to use after students have learned the standard US algorithm.
Resource ID#: 43271 Type: Problem-Solving Task
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General Information

Subject(s): Mathematics
Grade Level(s): 4
Intended Audience: Educators educators, Students , Parents
Keywords: To regroup or not to regroup, regroup, cpalms, icpalms, illustrativemathematics.org, illustrative mathematics, tasks, mathematics, math, resource, free, freely available, problems-based learning, student activities, Florida Standards
Instructional Component Type(s): Problem-Solving Task
Resource Collection: Illustrative Mathematics

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