1. Review Adding Integers
-8 + 4
9 + (-2)
-11 + (-12)
8 + (-12)

2. Chapter 2 Lesson 2D Pages 95-98
Subtracting Integers
Chapter 2
Lesson 2D
Pages 95-98

3. Learning Objectives and Vocabulary
I can subtract integers.
Standards: 7.NS.1, 7.NS.1c, 7.NS.1d, 7.NS.3, 7.EE.3
Vocabulary:

4. Warm-up, page 95.

5. Adding and Subtracting Integers
There are 3 ways to add and subtract integers:
Use a number line
Use counters
Memorize integer rules

6. One Way to SUbtract Integers Is With a Number Line
When using a number line, you must get to ONE sign between integers.
-if adding, move to the right
-if subtracting, move to the left - + 1 2 3 4 5 6 -1 -2 -3 -4 -5 -6

7. Number Line
When subtracting integers, get to one sign between integers. (sign always stays with first integer)
4 - (-2) = 4 + 2
minus a negative = a minus / # - (-#) = # + #

8. With a Number Line
4 - 6=
-6 - (-2) = 1 2 3 4 5 6 -1 -2 -3 -4 -5 -6

9. Using Counters
Place the proper number of each counters in an area and perform operation
eliminate using zero pairs

10. Using Counters
4 - 6=
-6 – (-2) =

11. Integers Rules
Rule #1 – Get to one sign between integers(That sign goes with the second number.) If the signs are the same, pretend the signs aren’t there. Add the numbers and then put the sign of the addends in front of your answer.
Rule #2 – Get to one sign between integers. If the signs are different pretend the signs aren’t there. Subtract the smaller from the larger one and put the sign of the one further from zero in front of your answer.

12. Using Rules
4 - 6=
-6 - (-2) =

13. Solve the Problems
3 - 5 =
4 – (-7) = =
-6 – (-7) =
5 - 9 =
-9 – (-9) =

14. Homework…