1. 2.3 Adding Integers 1 Medina

2.  Negative number – a less than zero. 0123456-2-3-4-5-6  Positive number – a greater than zero. 2Medina

3. Working with positive and negative numbers is like driving in traffic. You have to watch out for traffic signs and follow the driving rules. 3Medina

4.  If you don’t see a negative sign in front of a number it is positive. 9 + 4Medina

5.  Rule #1 – If the signs are the same, pretend the signs aren’t there. Add the numbers and keep the sign. 5Medina

6.  -3 + (-5)  4 + 7  3 + 4  -6 + (-7 )  5 + 9  -9 + (-9) 8 18 14 13 7 11 + - - - + + 6Medina

7.  Rule #2 – If the signs are different pretend the signs aren’t there. Subtract the smaller from the larger one and keep the sign of the larger number. 7Medina

8.  3 + (-5)  -4 + 7  3 + (-4)  -6 + 7  5 + (-9)  -9 + 9 -2 5 – 3 = 2 0 -4 +1+1 +3+3 9 – 9 = 0 9 – 5 = 4 7 – 6 = 1 4 – 3 = 1 7 – 4 = 3 8Medina

9. 0123456-2-3-4-5-6 When the number is positive count to the right. When the number is negative count to the left. +- 9Medina

10. 0123456-2-3-4-5-6 + - 3 + (-5) =-2 10Medina

11. 0123456-2-3-4-5-6 + - 6 + (-4) =+2 11Medina

12. 0123456-2-3-4-5-6 - + -5 + 3 =-2 12Medina