1. Opening Activity
Evaluate the following in your spiral on your Adding Positive and Negative Integers page. Write both the expression and the answer.
5 + (-8)
-3 + (-9)
-6 + 9
-4 + (-1)
Have homework out and ready to be checked.
You will need your spiral, pencil and a sheet of notebook paper.

2. Homework Check 56 -8 25
-14
-95 3 -7
200
100

3. Unit 1.3 Subtracting Integers

4. Table of contents Date Lesson Page # Unit 8/24 Multiplication Table 1
Divisibility Rules 2
8/25
Adding Positive and Negative Integers 3 1
8/28
Subtracting Positive and Negative Integers 1

5. Learning Goals
LG 702: Students will be able to apply and extend previous understandings of operations to add and subtract rational numbers.
LG 703: Apply and extend previous understandings of operations to multiply and divide rational numbers.

6. What are we doing today? Today I am working with integers.
So that I can subtract integers with the same or different signs.
I’ll know I’ve got it if I can accurately solve the following expression.
7 – (-16)

7. Subtracting Using Counters Page 19

8. Subtracting Using Counters – Page 19
How can you take away negative counters if there aren’t any?

9. Subtracting Using Counters – Page 19
2 negative
5 negative 3
5 negative
3 positive 3
X X X X X

10. Subtracting on a Number Line
Page 20

11. Subtracting on a Number Line Page 20-5 -1 5 -6 3 -7 3
right -4

12. Subtracting Integers by Adding the Opposite – Page 21
Math on the Spot
This video is from your textbook. These are available when you scan the QR codes on the pages of your book and are available in every lesson.

13. Subtracting Integers by Adding the Opposite – Page 21

14. Keep Change Change - 18 – 4 7 – (-5) -18 + (-4) 7 + 5 -22 12
When you subtract integers, you Keep Change Change (KCC).
Keep the sign of the first number.
Change the operation (subtraction to addition)
Change the sign of the second number (from positive to negative or negative to positive)
- 18 – 4
7 – (-5)
-18 + (-4)
7 + 5
-22 12

15. Keep Change Change

16. Adding & Subtracting Integers
Georgina works on the 30th floor of an office building. She took the elevator to the cafeteria on the 7th floor. How many floors did she travel?
23 floors
Gina had a balance of -$18 in her savings account. After making a deposit, she has $14 in her account. What is the overall change to her account?
$32

17. Exit Slip, Part 1

18. Exit Slip, Part 2

19. Homework
Page 23, #16-19
Due at the start of next class.