This document provides instruction on adding integers. It begins with examples of adding integers with integer chips. Rules are then developed for adding integers with the same sign and integers with different signs without using chips. These rules are applied to evaluate expressions. Extra practice examples are also provided, along with homework assigned from Castle Learning.

1. AIM: Adding Integers
Do Now
Subtract the following. Write your
answer in simplest form.
1 4
4 - 2 7
4
1

2. Basic Skills Quiz #1
1.) Evaluate the following and write your answer in simplest form.
2 1
3 4
2.) Multiply.
2.14 3.6
3.) Estimate the following solution.
50.1598 ÷ 12.5842
4.) Evaluate the following using the order of operations.
9-2 4+5
5.) Round the following to the nearest tenth.
168.1368
2

3. www.mathisfun.com
Try this website when you are
doing your Basic Skills Quiz
corrections
3

4. Anticipatory Set
Fill out the first two columns based on
what you know about integers.
What you Know Want to Learn What you
Learned
4

5. 5

6. 6

7. If the temperature is negative 8 degrees
and then rises 8 degrees, what is the final
temperature? Write a numeric expression to
represent this temperature change.
7

8. 1.) -5 + (-2) Removing Area
­1
­1 ­1
­1 ­1
­1
­1
Extra Pieces
­1 1
8

9. 2.) -3 + (-4) Removing Area
­1
­1 ­1 ­1
­1 ­1 ­1
Extra Pieces
­1 1
9

10. INDIVIDUALLY: Write a rule that allows you to add any
integers with the same sign without Integer Chips. (Just
pencil and paper)
10

11. 3.) 2 + (-3) Removing Area
1 ­1
1 ­1
­1
Extra Pieces
­1 1
11

12. 4.) -1 + 4 Removing Area
­1 1
1
1
1
Extra Pieces
­1 1
12

13. 5.) -6 + 2 Removing Area
­1
1
­1
­1 ­1 1
­1
­1
Extra Pieces
­1 1
13

14. 6.) 7 + (-3) Removing Area
Extra Pieces
­1 1
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15. INDIVIDUALLY: Write a rule that allows you to add any
integers with different signs without using Integer Chips. (Just
pencil and paper)
15

16. Final Rules
Adding Integers with the Same Sign: Find the sum of their
absolute values. Use the signs of the two integers.
Adding Integers with Different Signs: Find the difference of
their absolute values. Use the sign of the integers with the
greater absolute value.
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17. Use the rules to evaluate the following expressions.
1.) -4 + (-9) 2.) -3 + 15
3.) 9 + (-2) 4.) 0 + (-8)
5.) -8 + (-21) 6.) -18 + 7
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18. Extra Examples
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19. Before You Leave
1.) Explain whether -7 + 2 is the same as 7 + (-2).
2.) Explain whether 3 + (-5) is the same as -5 + 3.
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20. Homework
Castle Learning
Assignment due
Tomorrow
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