Document# Excerpt 5: Addition and Subtraction Situations by Grade Level (Page 9)

Progressions for the Common Core State Standards for Mathematics## Draft K Progression on Counting & Cardinality and K-5 Progression on Operations & Algebraic Thinking

Description: One of a series of documents describing the progression of a topic across several grade levels, informed both by research on children's development and by the structure of mathematics. These problems are a productive variation with two unknowns that give experience with finding all of the decompositions of a number and reflecting on the patterns involved.

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