Section 2.2 Addition of Integers 97 Section 2.2 Practice Exercises Study Skills Exercise Instructors vary in what they emphasize on tests. For example, test material may come from the textbook, notes, handouts, homework, etc.What does your instructor emphasize? Vocabulary and Key Concepts 1. a. The sum of a number and its opposite is . b. The sum of two negative numbers is (positive/negative). The sum of two positive numbers is (positive/negative). c. Explain how to find the sum of two numbers with different signs. Review Exercises For Exercises 2–8, place the correct symbol 1, , or 2 between the two numbers. 2. 6 5 3. 33 44 4. 5. 04 0 04 0 06 0 06 0 6. 0 6 7. 010 0 10 8. 122 2 Concept 1: Addition of Integers by Using a Number Line For Exercises 9–20, refer to the number line to add the integers. (See Examples 1 and 2.) 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9. 3 5 10. 6 3 11. 2 142 12. 5 112 13. 4 142 14. 2 152 15. 3 9 16. 1 5 17. 0 172 18. 152 0 19. 1 132 20. 4 132 Concept 2: Addition of Integers 21. Explain the process to add two numbers with the same sign. For Exercises 22–29, add the numbers with the same sign. (See Example 3.) 22. 23 12 23. 12 3 24. 8 132 25. 10 162 26. 7 192 27. 100 1242 28. 23 50 29. 44 45 30. Explain the process to add two numbers with different signs. For Exercises 31–42, add the numbers with different signs. (See Example 4.) 31. 7 1102 32. 8 2 33. 12 172 34. 3 9 35. 90 66 36. 23 49 37. 78 1332 38. 10 1232 39. 2 122 40. 6 6 41. 13 13 42. 45 1452
miller_prealgebra_2e_ch1_3
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