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1. 1-5 Subtracting Integers Course 3 Warm Up Problem of the Day Lesson Presentation

2. 1-5 Subtracting Integers Course 3 Warm Up Add. 1. –7 + 2 4. –6 + (–28) 2. –12 + (–9) 5. 104 + (–87) 3. 32 +(–19) 6. –18 + (–24) –5 –34 –21 17 13 –42

3. 1-5 Subtracting Integers +5 +2 +8 –5 Course 3 Problem of the Day Copy and complete the magic square. The magic sum is 0.

4. 1-5 Subtracting Integers Course 3 Learn to subtract integers.

5. 1-5 Subtracting Integers Course 3 Insert Lesson Title Here Subtracting a smaller number from a larger number is the same as finding how far apart the two numbers are on a number line. Subtracting an integer is the same as adding its opposite.

6. 1-5 Subtracting Integers Course 3 Additional Example 1: Subtracting Integers Subtract. A. –7 – 4 –7 – 4 = –7 + (–4) Add the opposite of 4. = –11 Same sign; use the sign of the integers. B. 8 – (–5) 8 – (–5) = 8 + 5 Add the opposite of –5. = 13 Same sign; use the sign of the integers. C.–6 – (–3) –6 – (–3) = –6 + 3 Add the opposite of –3. = –3 6 > 3; use the sign of 6.

7. 1-5 Subtracting Integers Course 3 Check It Out: Example 1 Subtract. A. 3 – (–6) 3 – (–6) = 3 + 6 Add the opposite of –6. Same signs; use the sign of the integers. = 9 B. –4 – 1 –4 – 1 = –4 + (–1) Add the opposite of 1. = –5 Same sign; use the sign of the integers. C.–7 – (–8) –7 – (–8) = –7 + 8 Add the opposite of –8. = 1 8 > 7; use the sign of 8.

8. 1-5 Subtracting Integers Course 3 Additional Example 2A: Evaluating Expressions with Integers Evaluate the expression for the given value of the variable. 8 – j for j = –6 8 – j 8 – (–6) Substitute –6 for j. = 8 + 6 Add the opposite of –6. = 14 Same sign; use the sign of the integers.

9. 1-5 Subtracting Integers Course 3 Additional Example 2B: Evaluating Expressions with Integers Evaluate the expression for the given value of the variable. –9 – y for y = –4 –9 – y –9 – (–4) Substitute –4 for y. = –9 + 4 Add the opposite of –4. = –5 9 > 4; use the sign of 9.

10. 1-5 Subtracting Integers Course 3 Additional Example 2C: Evaluating Expressions with Integers Evaluate each expression for the given value of the variable. n – 6 for n = –2 n – 6 –2 – 6 Substitute –2 for n. = –2 + (–6) Add the opposite of 6. = –8 Same sign; use the sign of the integers.

11. 1-5 Subtracting Integers Course 3 Check It Out: Example 2A Evaluate the expression for the given value of the variable. 11 – m for m = –3 11 – m 11 – (–3) Substitute –3 for m. = 11 + 3 Add the opposite of –3. = 14 Same sign; use the sign of the integers.

12. 1-5 Subtracting Integers Course 3 Check It Out: Example 2B Evaluate the expression for the given value of the variable. –5 – r for r = –2 –5 – r –5 – (–2) Substitute –2 for r. = –5 + 2 Add the opposite of –2. = –3 5 > 2; use the sign of 5.

13. 1-5 Subtracting Integers Course 3 Check It Out: Example 2C Evaluate each expression for the given value of the variable. a – 7 for a = –9 a – 7 –9 – 7 Substitute –9 for a. = –9 + (–7) Add the opposite of 7. = –16 Same sign; use the sign of the integers.

14. 1-5 Subtracting Integers Course 3 Additional Example 3: Architecture Application The top of the Sears Tower in Chicago, is 1454 feet above street level, while the lowest level is 43 feet below street level. How far is it from the lowest level to the top? Subtract the lowest level from the height. 1454 – (–43) Add the opposite of (–43). 1454 + 43 Same sign; use the sign of the integers. = 1497 It is 1497 feet from the lowest level to the top.

15. 1-5 Subtracting Integers Course 3 Check It Out: Example 3 The distance from the high dive to the swimming pool is 10 feet. The pool is 12 feet deep. What is the total distance from the high dive to the bottom of the pool? Subtract the depth of the pool from the height of the high dive. 10 – (–12) 10 + 12 Add the opposite of (–12). Same sign; use the sign of the integers. = 22 It is 22 feet from the diving board to the bottom of the pool.

16. 1-5 Subtracting Integers Course 3 Insert Lesson Title Here Lesson Quiz: Part I Subtract. 1. –6 – (–4) -2 2. –3 – 3 –6 3. 4 – (–5) –1 Evaluate each expression for the given value of the variable. 4. 9 – s for s = –5 14 5. –4 – w + 5 for w = 21 –20

17. 1-5 Subtracting Integers Course 3 Insert Lesson Title Here Lesson Quiz: Part II 6. Suretta is flying in an airplane, and rises an additional 20 feet. Then she descends 190 feet toward the ground. How far below her original height did Suretta go? 170 feet