1. Positives and Negatives-4 -3 -2 -1 1 2 3 4 5

2. Meet Pete
The Positive Pirate

3. Together, they’re called the “Positives”

4. Now meet their arch enemies…

5. Ned
The Negative Ninja

6. Together, they’re called the “Negatives”

7. These two don’t like each other very much.

8. Every time they meet, they always fight
Yaaaar going down!
Hiiii-Yah!
And they ALWAYS destroy each other in the process

9. So what happens when a lot of positives…
…are confronted by a bunch of negatives

10. 1 Positive is left after the battle+1
1 Positive is left after the battle -3
3 negatives +4
4 positives

11. -3
3 negatives are left -8 +5

12. +8
8 Positives are left -7
+15

13. When you’ve got 2 positives…
Hi! +9
9 Positives
Hello!
They combine to make a bigger positive! +4 +5

14. -4 and -8 combined equals…
Hello!
-12
12 Negatives
Hi! -4 -8

15. So lets review what we learned…
+1 -1 = 0
-3 +4 = +1
-8 +5 = -3
= +8
+4 +5 = +9
-4 -8 = -12

16. Take Note:
+1 -1 = 0
-3 +4 = +1
-8 +5 = -3
= +8
+4 +5 = +9
-4 -8 = -12

17. When you have a positive and a negative number, you subtract
Take Note:
+1 -1 = 0
When you have a positive and a negative number, you subtract
-3 +4 = +1
-8 +5 = -3
= +8
+4 +5 = +9
-4 -8 = -12

18. Take Note: +1 -1 = 0 -3 +4 = +1 -8 +5 = -3 -7 +15 = +8 +4 +5 = +9
When you have a positive and a negative number, you subtract
-3 +4 = +1
-8 +5 = -3
= +8
When you have 2 positives or 2 negatives, you add them up
+4 +5 = +9
-4 -8 = -12

19. +1 -1 = 0 -3 +4 = +1 -8 +5 = -3 -7 +15 = +8 +4 +5 = +9 -4 -8 = -12
But after we subtract, how do we know whether the answer will be positive or negative?
-3 +4 = +1
-8 +5 = -3
= +8
+4 +5 = +9
-4 -8 = -12

20. -12 +9 = -3 For Example… The larger number always wins!
Since there are more negatives than positives, the answer is negative

21. -3 +7 = +4 For Example… The larger number always wins!
Since there are more positives than negatives, the answer is positive

22. Sample Problems

23. Who Will Win The Battle? Will the answer be positive or negative?
= = = = = = - - + - + +

24. Who Will Win The Battle? Should you add or subtract?
= = = = = = -
Subtract -
Subtract + -
Add
Subtract +
Add +

25. Who Will Win The Battle? Solve the problem
Subtract
= = = = = = - 6
Subtract - 2
Subtract + 2 - 13
Add
Subtract + 3
Add + 18