Unit 4, Lesson 23-- Subtraction with Decomposing

Lesson 23-- Subtraction with Decomposing

Introduction

Hello Mathematicians! Today we will work on decomposing, or breaking apart numbers, to help us when subtracting. 

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Video

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Interactive

Directions:

• Open the interactive drawing link below, and make a copy.
• Solve each problem using the decomposing strategy, and fill in the missing digits.

Subtraction Interactive Drawing Links to an external site.

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In Your Math Notebook:

Let’s get out our math journals and  work through the following application problem. Make sure you read the problem carefully, draw a picture to match your thinking and write and solve an equation.

Read, Draw, Write. DONE!

R (Read the problem carefully.) There were 171 students in the lunchroom.  One hundred five students left the lunchroom. How many students are still in the lunchroom? D (Draw a picture.) W (Write and solve an equation.)

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