1. Adding Integers
Review

2. Bell Ringer
• A positive + a positive is (always, sometimes, never)
a positive.
• A positive + a positive is (always, sometimes, never)
a negative.
• A negative + a negative is
(always, sometimes, never) negative.
• A positive + a negative is
(always, sometimes, never) a positive.

3. Bell Ringer
• A positive + a positive is (always, sometimes, never)
a positive.
o POSITIVE
• A positive + a positive is (always, sometimes, never)
a negative.
o NEVER
• A negative + a negative is (always, sometimes,
never) negative.
o ALWAYS
• A positive + a negative is (always, sometimes,
never) a positive.
o SOMETIMES

4. Where we were…
• Adding integers
o Same signs…
o Opposite signs…
• Subtracting Integers
o Additive inverse
• Absolute value

5. Where we are…
• Students will learn to…
o Review the rules for adding integers.

6. Homework

7. Unit Plan
• I can… represent addition and subtraction on a
horizontal number or vertical number line.
o Rate yourself and date
• I can… solve real-world and mathematical
problems involving the four operations with rational
numbers.
o Rate yourself and date

8. Where we are going…
• Quiz on Friday
o Adding integers
o Subtracting integers

9. Adding Integers
• Power Write #1
o Describe the rules for adding integers with the same signs…
• Power Write #2
o Describe the rules for adding integers with opposite signs…

10. Adding Integers
• Power Write #1
o Describe the rules for adding integers with the same signs…
• Add the numbers, keep the common sign
• Power Write #2
o Describe the rules for adding integers with opposite signs…
• Subtract the numbers, keep the sign of the number with the larges
absolute value.

11. -10 + (-20)
• How do you know?

12. -10 + (-20)
• How do you know?
• - 30; add and keep the common sign

13. -20 + (-10)
• What property allows you to switch the order of
addition?

14. -20 + (-10)
• What property allows you to switch the order of
addition?
• - 30; commutative property

15. - ½ + (- ½ )

16. - ½ + (- ½ )
• - 1

17. 15 + (-9)

18. 15 + (-9)
• 6

19. -13 + 20

20. -13 + 20
• 7

21. -7 + ___ = 0
• What is this called?

22. -7 + ___ = 0
• What is this called?
• 7; zero pairs, additive inverse, opposites

23. -9 + 9 + (-14)

24. -9 + 9 + (-14)
• -14

25. Algebra
• The sum of a number and -20 = 40. What is the
number?

26. Algebra
• The sum of a number and -20 = 40. What is the
number?
• 60 + (-20) = 40

27. x + y
When: x = 5, y = -1

28. x + y
When: x = 5, y = -1
5 + (-1) = 4

29. Word Problem
• A football team gained 7 yards on the first play, lost
9 yards on the second play and gained 6 yards on
the third play. To get a first down, they must gain 10
yards on 4 plays.
• Write an addition expression that shows this
scenario.
• How many yards will the team need to gain on it’s
fourth play to get a first down?

30. Word Problem
• A football team gained 7 yards on the first play, lost
9 yards on the second play and gained 6 yards on
the third play. To get a first down, they must gain 10
yards on 4 plays.
• Write an addition expression that shows this
scenario.
o 7 + (-9) + 6
• How many yards will the team need to gain on it’s
fourth play to get a first down?
o They have gained 4 yards, so they need 6 more yards for a first down.

31. Homework
• Adding integers review worksheet
• Due tomorrow.