1. Course 2, Lesson 3-3 Add. 1. −4 + 4 2. 8 + (−7) 3. 3 + (−5) Write an addition expression to describe each situation. Then find each sum and explain the meaning. 4. A bird flies up 50 feet and swoops back down 10 feet. 5. Teresa owes her brother $14. She finds $10 and gives it to him. 6. What is the value of x + y if x = −3 and y = −9?

2. Course 2, Lesson 3-3 ANSWERS 1. 0 2. 1 3. −8 4. 50 + (−10) = 40; the bird is 40 feet above where it started. 5. −14 + 10 = −4; Theresa still owes her brother $4. 6. –12

3. WHAT happens when you add, subtract, multiply, and divide integers? The Number System Course 2, Lesson 3-3

4. To subtract integers To solve real-world problems involving integers Course 2, Lesson 3-3 The Number System

5. Course 2, Lesson 3-3 The Number System Words To subtract an integer, add its additive inverse. Symbols p − q = p + (−q) Examples 4 − 9 = 4 + (−9) = −5 7 − (−10) = 7 +(10) = 17

6. Course 2, Lesson 3-3 The Number System

7. Course 2, Lesson 3-3 The Number System

8. Course 2, Lesson 3-3 The Number System

9. Course 2, Lesson 3-3 The Number System

10. Course 2, Lesson 3-3 The Number System

11. Course 2, Lesson 3-3 The Number System

12. Course 2, Lesson 3-3 The Number System

13. Course 2, Lesson 3-3 The Number System

14. Course 2, Lesson 3-3 The Number System

15. Course 2, Lesson 3-3

17. How did what you learned today help you answer the WHAT happens when you add, subtract, multiply, and divide integers? Course 2, Lesson 3-3 The Number System

18. How did what you learned today help you answer the WHAT happens when you add, subtract, multiply, and divide integers? Course 2, Lesson 3-3 The Number System Sample answers: When you subtract an integer, you add its additive inverse.

19. Find the value of – 14 – 8. Ratios and Proportional RelationshipsThe Number System Course 2, Lesson 3-3