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1. Lesson Menu Main Idea NGSSS Key Concept: Subtract Integers Example 1: Subtract Positive Integers Example 2: Subtract Positive Integers Example 3: Subtract Negative Integers Example 4: Subtract Negative Integers Example 5: Evaluate an Expression Example 6: Real-World Example Five-Minute Check

2. Use the rules for subtracting integers. Main Idea/Vocabulary

3. MA.7.A.3.1 Use and justify the rules foradding, subtracting, multiplying, dividing, and finding the absolute value of integers. Also addresses MA.7.A.3.2. NGSSS

4. Key Concept

5. Subtract Positive Integers Find 2 – 15. 2 – 15 = 2 + (–15) To subtract 15, add –15. = –13 Simplify. Answer: –13 Example 1

6. Find 4 – 11. A. –15 B. –7 C. 7 D. 15 Example 1 CYP

7. Subtract Positive Integers Find –13 – 8. –13 – 8 = –13 + (–8) To subtract 8, add –8. = –21 Simplify. Answer: –21 Example 2

8. Find –22 – 2. A. 24 B. 20 C. –20 D. –24 Example 2 CYP

9. Subtract Negative Integers Find 12 – (–6). 12 – (–6) = 12 + 6 To subtract –6, add 6. = 18 Simplify. Answer: 18 Example 3

10. Find 4 – (–13). A. –17 B. –9 C. 9 D. 17 Example 3 CYP

11. Subtract Negative Integers Find –21 – (–8). –21 – (–8) = –21 + 8 To subtract –8, add 8. = –13 Simplify. Answer: –13 Example 4

12. Find –8 – (–1). A. 9 B. 7 C. –7 D. –9 Example 4 CYP

13. Evaluate an Expression ALGEBRA Evaluate g – h if g = –2 and h = –7. g – h = –2 – (–7)Replace g with –2 and h with –7. = –2 + (7) To subtract –7, add 7. = 5 Simplify. Answer: 5 Example 5

14. ALGEBRA Evaluate f –x if f = –1 and x = –9. A. 10 B. 8 C. –8 D. –10 Example 5 CYP

15. GEOGRAPHYIn Mongolia, the temperature can fall to –45°C in January. The temperature in July may reach 40°C. Find the difference between these two temperatures in Mongolia. Subtract the lower temperature from the higher temperature. 40 – (–45) = 40 + 45 To subtract –45, add 45. = 85 Simplify. Answer: The difference between the temperatures is 85°C. Example 6

16. TEMPERATUREThe temperature in Michigan fell to a low of –10°C in January, while in California the temperature reached a high of 91°C. Find the difference between the temperatures in these two states. A. –101°C B. –81°C C. 81°C D. 101°C Example 6 CYP

17. Find 4 + (–5). A. –9 B. –1 C. 1 D. 9 Five Minute Check 1

18. Find –14 – 34. A. 48 B. 20 C. –20 D. –48 Five Minute Check 2

19. Find –45 – (–8). A. 52 B. 37 C. –37 D. –52 Five Minute Check 3

20. Evaluate c – b if b = 3 and c = –1. A. –4 B. –2 C. –1 D. 4 Five Minute Check 4

21. Evaluate 9 – a if a = –2. A. –11 B. –7 C. 7 D. 11 Five Minute Check 5

22. What is –4 subtracted from –3? A. –7 B. –1 C. 1 D. 7 Five Minute Check 6