1. Splash Screen

2. KC 1 Interactive Lab: Subtracting Positive and Negative Integers

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

4. 1.A 2.B 3.C 4.D Example 1 A.–34 B.–8 C.8 D.34 Find 13 – 21.

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

6. 1.A 2.B 3.C 4.D Example 2 A.–20 B.–2 C.2 D.20 Find –9 – 11.

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

8. 1.A 2.B 3.C 4.D Example 3 A.–13 B.–5 C.5 D.13 Find 9 – (–4).

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

10. 1.A 2.B 3.C 4.D Example 4 A.–23 B.–11 C.11 D.23 Find 17 – (–6).

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

12. 1.A 2.B 3.C 4.D Example 5 A.–10 B.–2 C.2 D.10 ALGEBRA Evaluate m – n if m = –6 and n = 4.

13. Example 6 Use Integers to Solve a Problem GEOGRAPHY In Mongolia, the temperature can fall to –45ºC in January. The temperature in July may reach 40ºC. What is the difference between these two temperatures? To find the difference in temperatures, subtract the lower temperature from the higher temperature. Answer: The difference between the temperatures is 85ºC. 40 – (–45)=40 + 45To subtract –45, add 45. =85Simplify.

14. 1.A 2.B 3.C 4.D Example 6 A.–26ºF B.–4ºF C.4ºF D.26ºF TEMPERATURE On a particular day in Anchorage, Alaska, the high temperature was 15ºF and the low temperature was –11ºF. What is the difference between these two temperatures for that day?

15. End of the Lesson