Excerpt 3: Types of Addition and Subtraction Situations, and Methods for Solving Single-Digit Addition and Subtraction Problems (Pages 6-7)

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. Students develop meanings for addition and subtraction as they encounter problem situations in Kindergarten, and they extend these meanings as they encounter increasingly difficult problem situations in Grade 1. And they learn and use increasingly sophisticated computation methods to find answers.