# Decompose 10

Kindergarten • Half Day Lesson Plan## Quick Facts

Subject: Math, Operations and Algebraic Thinking

Type: Half Day Lesson Plan

CCSS: K.OA.4

Skills: Decompose 10, Writing Equations that Equal 10, Counting to Find Missing Addends

File Type: PDF Document

Materials Needed: pencils, crayons/colored pencils (orange and blue), 10 counting objects – chips, small animals, cubes, etc., unifix cubes – tower with 10 cubes – 5 cubes of one color and 5 cubes of another color (1 tower of cubes per partner/group), and a document camera or whiteboard

Printable Resources:
**Printable Resources:** “Exit Slips” (as an optional assessment component, 1 copy per student), “Ten Frames” (1 copy per student, 1 copy for display), “Make 10” (1 copy per student)

## Lesson Plan Description

This fully scripted Kindergarten half day lesson plan is broken down into 2 separate segments (30-60 minutes each). The lessons address Operations and Algebraic Thinking: For any number from 1 to 9, find the number that makes 10 when added to the given number, e.g., by using objects or drawings, and record the answer with a drawing or equation (K.OA.4). These lessons include: a review of counting to 10, separating 10 objects into 2 distinct groups, illustrating these distinct groups using an addition equation, and using ten frames to visually show the decomposition of a number. This lesson includes an exit slip as an optional assessment component and a game called, “Snap It” to review and practice decomposing numbers less than or equal to 10.

**Segment 1:**Students will separate 10 objects into 2 groups in different ways. Then they will write number sentences adding 2 numbers to equal 10. Students will also use a ten frame to decompose the number 10.**Segment 2:**Students will further practice these skills by playing a game called “Snap It – Decomposing the number 10”

These lessons can be taught over the span of a half day or you can use the lessons independently, broken up over several days.