teaching resource

Composing and Decomposing Numbers - Instructional Slide Deck

Updated: 04 Jan 2023

Introduce composing and decomposing numbers to your students with this instructional slide deck.

Editable: Google Slides
Pages: 1 Page
Grades: K - 1

Curriculum

CCSS.MATH.CONTENT.K.OA.A.3

Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1).
CCSS.MATH.CONTENT.K.NBT.A.1

Compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings, and record each composition or decomposition by a drawing or equation (such as 18 = 10 + 8); understand that these numbers are compos...
CCSS.MATH.CONTENT.1.OA.B.3

Apply properties of operations as strategies to add and subtract.2 Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 ...
CCSS.MATH.CONTENT.1.OA.C.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - ...

teaching resource

Composing and Decomposing Numbers - Instructional Slide Deck

Updated: 04 Jan 2023

Introduce composing and decomposing numbers to your students with this instructional slide deck.

Editable: Google Slides
Pages: 1 Page
Grades: K - 1

Introduce composing and decomposing numbers to your students with this instructional slide deck.

Compose and Decompose Numbers

The idea of composing and decomposing numbers is used when beginning to understand the concepts of addition and subtraction. This instructional slide deck outlines multiple ways to compose and decompose numbers by using an understanding of part-part-whole relationships.

This slide deck has three sections:

Using a Ten Frame
Drawing it Out
Using Fingers

Through this activity, students will learn multiple ways to practice composing and decomposing numbers.

Tips for Differentiation + Scaffolding

A team of dedicated, experienced educators created this resource to support your math lessons.

If you have a mixture of above and below-level learners, check out these suggestions for keeping students on track with the concepts:

🆘 Support Struggling Students

Help students who need help understanding the concepts by giving them concrete materials to match the examples used in the slide deck.

➕ Challenge Fast Finishers

Challenge students by encouraging them to give examples of when they may use part-part-whole relationships in the real world.

Easily Prepare This Resource for Your Students

This resource downloads as an editable Google Slides file.

This resource was created by Kendall Britnell, a teacher in Colorado and a Teach Starter collaborator.

Curriculum

CCSS.MATH.CONTENT.K.OA.A.3

Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1).
CCSS.MATH.CONTENT.K.NBT.A.1

Compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings, and record each composition or decomposition by a drawing or equation (such as 18 = 10 + 8); understand that these numbers are compos...
CCSS.MATH.CONTENT.1.OA.B.3

Apply properties of operations as strategies to add and subtract.2 Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 ...
CCSS.MATH.CONTENT.1.OA.C.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - ...

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