1. Section 2.3
Subtracting Integers

2. Steps Given the four options Double negatives equal a positive
1 a - b
2 -a - (-b)
-a - b
a - (-b)
Double negatives equal a positive
1 a + (- b)
-a – (-b) = -a + (b)
-a + (- b)
a – (-b) = a + (b)
Follow the adding Rules

3. Option 1
Option 1 a – (b) = a + (- b)
Example : 934 – (23)

4. Option 2
Option 2 -a – (-b) = -a + (b)
Example -72 – (-150)

5. Option 3
Option 3 -a – (b) = -a + (- b)
Example – (23)

6. Option 4
Option 4 a – (-b) = a + (b) Example 691 – (-52)

7. Example
Simplify
-12 – (-34)
345 – (-12)
-903 – (49)
12 – (162)

8. Example
Simplify
-457 – (-123)
55 – (-84)
6,914 – (456)
-14 – (297)

9. Word Problem
The coldest temperature ever recorded on Earth was -129°F in Antarctica. The warmest temperature ever recorded was 134°F in Death Valley, California. How many degrees warmer is 134°F than -129°F

10. Example
Find the difference in temperature between the Months of March and February.
Find the difference in temperature between the months of November and December.