Decomposition and addition up to 10
Decomposition and addition up to 10

Decomposition and addition up to 10

I can decompose and add numbers up to 10.

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General

In this lesson, students will learn about the different ways to decompose numbers up to 10.

Standards

CCSS.MATH.Content.K.OA.A

Learning objective

Students will be able to decompose and add numbers up to 10.

Introduction

Students will count three sets of objects. Explain why it is useful to know how to decompose groups of objects in different ways.

Instruction

Explain how decomposition works with the example, "3 and 3 makes 6." Students can use different strategies to decompose, such as using one number of the equation (an addend) and determining how many more have to be added.

Students will then practice decomposing 7 by dragging 7 fish to 2 different fishbowls. Next, they will look at all the different ways they could have decomposed 7. They will read through each way and look at the numbers.

They will also learn how to express the decomposition with a number bond. They will decompose groups of images, like squirrels and cats. Remind students they can use manipulatives to help them visualize as well.

Quiz

Students will respond to nine fill-in-the-blank questions.

Closing

Students will practice decomposing more groups of objects, like tomatoes and oranges.

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