1. Find each sum. 1. –4 + 62. 5 + 12 3. –3 + 34. –8 + 9 Give the opposite of each number. 5. 76. –8 7. –38. 1 2 17 0 1 –7 8 3 –1 Do Now

2. 2/9/2015 7-3 D Subtracting Integers

3. Move left on a number line to subtract a positive integer. Move right on a number line to subtract a negative integer. Subtracting Integers on a Number Line

4. Example 1 Write the subtraction modeled on each number line. A. B. –8 –7 – 6 –5 –4 –3 –2 –1 0 1 –3 –4 The subtraction modeled is –3 – 4 = –7. –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 (–5) – (–9) The subtraction modeled is –5 – (–9) = 4.

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6. Example 2 Find the difference. 4 – 6 4 – 6 = –2 (–6) 4 –3 –2 –1 0 1 2 3 4 5

7. Example 3 Find the difference. 3 – (–3) –(–3) 3 3 – (–3) = 6 –1 0 1 2 3 4 5 6 7

8. Example 4 Evaluate a – 4 for a = 2. a – 4Write the expression. 2 – 4Substitute 2 for a. –2Subtract.

9. Find each difference. 1. 8 – 52. –9 – (–3) Evaluate x – (–7) for each value of x. 3. x = –24. x = 5 5. The peak of Mt. Everest is approximately 26,544 ft above sea level. The shore of the Dead Sea is about 1,200 ft below sea level. How much higher is the peak of Mt. Everest than the shore of the Dead Sea? –6 3 5 27,744 ft 12 Exit Ticket

10. 1. Identify the difference. 9 – 6 A. 3 B. –3 C. 15 D. –15

11. 2. Identify the difference. –11 – (–8) A. 3 B. –3 C. 19 D. –19

12. 3. Evaluate p – (–8) for p = –9. A. 17 B. 1 C. –1 D. –17

13. 4. Evaluate s – (–8) for s = 13. A. 21 B. 5 C. –5 D. –21

14. 5. A submarine is 150 feet below the sea level. An airplane is 1,000 feet above the sea level and directly above the submarine. What is the distance between the airplane and the submarine? A. 850 ft B. 1,000 ft C. 1,150 ft D. 1,500 ft

15. Homework Subtracting Integers W.S.