1. Integers

2. Green counters = positive numbers = + 3
Red counters = negative numbers
= -3

3. 1 green counter and 1 red counter together – cancel each other outx x x x x x

4. Adding Integers

5. Adding Integers – Same Signs
+ 3
3 green + 2 green =
5 green + +
= +5
+ 2

6. Adding Integers – Same Signs
- 4 + +
4 red + 1 red =
5 red
- 1
= -5

7. Adding Integers – Different Signsx x
1 green and 1 red will cancel each other out (zero pair)
+ 3 + + x x
1 green (1 positive) remains
- 2
= +1

8. Adding Integers – Different Signsx x
1 green and 1 red will cancel each other out
+ 2 + +
1 red (1 negative) remains x x
- 3
= -1

9. Adding Integers – Different Signsx x
1 green and 1 red will cancel each other out
+ 4 + +
2 green (2 positive) remain x x
- 2
= +2

10. Adding Integers – Different Signsx
1 green and 1 red will cancel each other out
+ 1
3 red (3 negative) remains + + x
= -3
- 4

11. Add the numbers and keep the sign
Rule for same signs:
Positive +Positive =
Positive
Negative
Negative + Negative =
Add the numbers and keep the sign

12. Rule for different signs:
Positive + Negative or
Negative + Positive
Subtract and take the sign of the higher number

13. Rule for adding integers:
Same signs,
add and keep
Different signs,
subtract
Take the sign of the higher one,
then you’ll be exact