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Excerpt 3: Types of Addition and Subtraction Situations, and Methods for Solving Single-Digit Addition and Subtraction Problems (Pages 6-7)
Progressions for the Common Core State Standards for MathematicsDraft 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