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Principles and Standards (2002): Making Mathematical Arguments in the Primary Grades
Joy Whitenack, Erna Yackel
Source abstract
Students in Ms. Jones's second-grade class have just reconvened from working on several problems. Once the children are seated in the front of the room, Ms. Jones asks Casey to explain his answer of 16 for the following problem: “Aunt Mary has 31 pieces of candy on the counter and Uncle Johnny eats 15 pieces of candy.
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