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Main Idea
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
• Use the rules for subtracting integers.
Subtract Positive Integers
Find 2 – 15.
2 – 15 = 2 + (–15) To subtract 15, add –15.
= –13 Simplify.
Answer: –13
A. –15
B. –7
C. 7
D. 15
Find 4 – 11.
Find –13 – 8.
Subtract Positive Integers
–13 – 8 = –13 + (–8) To subtract 8, add –8.
= –21 Simplify.
Answer: –21
A. 24
B. 20
C. –20
D. –24
Find –22 – 2.
Subtract Negative Integers
Find 12 – (–6).
12 – (–6) = 12 + 6 To subtract –6, add 6.
= 18 Simplify.
Answer: 18
A. –17
B. –9
C. 9
D. 17
Find 4 – (–13).
Find –21 – (–8).
Subtract Negative Integers
–21 – (–8) = –21 + 8 To subtract –8, add 8.
= –13 Simplify.
Answer: –13
A. 9
B. 7
C. –7
D. –9
Find –8 – (–1).
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
A. 10
B. 8
C. –8
D. –10
ALGEBRA Evaluate f – x if f = –1 and x = –9.
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) = 40 + 45 To subtract –45, add 45.
= 85 Simplify.
Answer: The difference between the temperatures is 85°C.
A. –101°C
B. –81°C
C. 81°C
D. 101°C
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.
