In this unit, students will begin to develop their understanding of the number system, starting with rote counting within 5 and extending it to at least 20. Counting begins with this unit and students are given many opportunities to practice throughout the year so they can become fluent in the counting sequence, enabling them to focus on the pairings involved when counting objects. Students learn to count a set of up to 10 objects to develop one-to-one correspondence and cardinality. Students connect the last number said with the quantity of the set, rather than the object itself. This unit focuses on students organizing objects into lines to count efficiently. More difficult arrangements will be addressed in subsequent units.

Content Standards: K.CC.A.1, K.CC.B.4a, K.CC.B.4b

Practice Standards: S.MP.2, S.MP.6

## Unit at a Glance

## Lessons in this unit have been temporarily archived as they undergo maintenance work.

## Lesson 1 (1 day)

**Key Concept 1: Numbers exist in a sequence that does not change, and can be counted.**

## Lesson 2 (1 day)

**Key Concept 2: Each item in a collection must be counted once and only once.**

## Lesson 3 (1 day)

**Key Concept 3: The last number name used names the quantity of objects in the set.**

## Lessons 4-10 (7 days)

**Key Concept 1: Numbers exist in a sequence that does not change, and can be counted.**

**Key Concept 2: Each item in a collection must be counted once and only once.**

**Key Concept 3: The last number name used names the quantity of objects in the set.**