# Lesson: Developing + and -

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### Lesson Objective

Students will develop automaticity when adding and subtracting; understand the concepts of adding and subtracting.

### Lesson Plan

Do Now

In your math journals, write a fact family for each.

a. 6, 3, 9

b. 8, 10, 18

c. 7, 4, 11

Opening

• State today's objective.
•  Review the terms sum, difference.

Guided Practice

• Explain to the students that you are going to roll a die.
•  Roll the die. Record the number on the whiteboard.
• Record the number.
•  Roll the die again.  Record the number on the whiteboard.
•  Tell students that if our first number is bigger than the second number, we will subtract.   Tell student that if our first number is bigger than the second number, we will add.
• Model setting up several problems.
• Allow for student to solve each.

Independent Practice

• Distribute and explain Independent Practice for Developing + and – Lesson Facts Practice

-or-

Closing

• In your writing journal, write a response to the following: What is the difference between addition and subtraction?

### Lesson Resources

 IP Developing and Lesson 720 Addition and Subtraction Fact Practice 1709 Adding Whole Numbers IP   Activity 6,198