Document

# Excerpt 1: Overview of Counting & Cardinality in Grade K and Operations & Algebraic Thinking in Grades K-5 (Pages 2-3)

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. Although most of the standards organized under the OA heading involve whole numbers, the importance of the Progression is much more general because it describes concepts, properties, and representations that extend to other number systems, to measures, and to algebra. The generality of the concepts involved in Operations and Algebraic Thinking means that students' work in this area should be designed to help them extend arithmetic beyond whole numbers and understand and apply expressions and equations in later grades.