1. Do Now Solve -30 + (-51) = -34 + (-47) = -36 + 15 = 12 + (-42) =
120 + (-36) = =
27 + (-42) = = =
47 + (-9) = =
4 + (-26) =
-40 + (-5) =
41 + (-4) =

2. Do Now Solve 25 + 45 = 70 -25 + 45 = 20 47 + (-9) = 38 -44 + 16 = -28
4 + (-26) = -22
-40 + (-5) = -45
41 + (-4) = 37
-30 + (-51) = -81
-34 + (-47) = -81
= -21
12 + (-42) = -30
120 + (-36) = 84
= 42
27 + (-42) = -15

3. Subtracting Integers When subtracting:
Find the ADDITIVE INVERSE of the second integer
Then solve as an addition problem

4. Subtracting Integers When subtracting: What is additive inverse?
Find the ADDITIVE INVERSE of the second integer
Then solve as an addition problem
What is additive inverse?
It’s simply the opposite of a number

5. Subtracting Integers How do we find the additive inverse?
Ex – 21 =

6. Subtracting Integers How do we find the additive inverse?
Ex – 21 =
Change the subtraction sign to an addition sign =

7. Subtracting Integers How do we find the additive inverse?
Ex – 21 =
Change the subtraction sign to an addition sign =
Take the opposite of the second integer
-14 + (-21) = -35

8. Subtracting Integers Try finding the additive inverse first:
Ex. 20 – 25 =
Ex. 16 – (-13) =
Ex – 14 =
Ex – (-4) =

9. Subtracting Integers Try finding the additive inverse first:
Ex. 20 – 25 =
20 + (-25) = -5
Ex. 16 – (-13) =
Ex – 14 =
Ex – (-4) =

10. Subtracting Integers Try finding the additive inverse first:
Ex. 20 – 25 =
20 + (-25) = -5
Ex. 16 – (-13) =
16 + (+13) = 29
Ex – 14 =
Ex – (-4) =

11. Subtracting Integers Try finding the additive inverse first:
Ex. 20 – 25 =
20 + (-25) = -5
Ex. 16 – (-13) =
16 + (+13) = 29
Ex – 14 =
-21 + (-14) = -35
Ex – (-4) =

12. Subtracting Integers Try finding the additive inverse first:
Ex. 20 – 25 =
20 + (-25) = -5
Ex. 16 – (-13) =
16 + (+13) = 29
Ex – 14 =
-21 + (-14) = -35
Ex – (-4) =
-30 + (+4) = -26