Integer Subtraction

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Objective

Students will model subtraction of integers using a number line.

Big Idea

Is subtraction the complete opposite of addition?

Lesson Author

Jada Jackson

Columbus, OH

Grade Level

Seventh grade

Subjects

Math

Number Sense and Operations

Standards

7.NS.A.1c

Understand subtraction of rational numbers as adding the additive inverse, p – q = p + (–q). Show that the distance between two rational numbers on the number line is the absolute value of their difference, and apply this principle in real-world contexts.

7.NS.A.1d

Apply properties of operations as strategies to add and subtract rational numbers.

MP1

Make sense of problems and persevere in solving them.

MP2

Reason abstractly and quantitatively.

MP3

Construct viable arguments and critique the reasoning of others.

MP4

Model with mathematics.

Launch

5 minutes

Do the same rules apply to subtraction?

POD

As student enter the room, they will have a seat, take out their Problem of the Day (POD) sheet and begin to work on the question on the SMARTboard. The POD also allows students to use MP 3 continually based on the discussions we have about the problem each day.

Use the number line to model how to perform the following subtraction:

-5 – (-7)

Learning Target

The target for the day is also on the SMARTboard each day when students enter the room. The target for today’s lesson is for students to model subtraction using a number line.