2. Key Concept: Subtract Integers Example 1: Subtract Positive Integers
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
Lesson Menu

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

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

5. Key Concept

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

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

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

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

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

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

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

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

14. 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

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

16. Subtract the lower temperature from the higher temperature.
GEOGRAPHY In 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) = To subtract –45, add 45.
= 85 Simplify.
Answer: The difference between the temperatures is 85°C.
Example 6

17. TEMPERATURE The 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

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

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

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

21. Evaluate c – b if b = 3 and c = –1.
Five Minute Check 4

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

23. What is –4 subtracted from –3?
Five Minute Check 6