1. Positive and Negative Numbers by Mr. Russo

2. We know when we see positive numbers, but when do we use or see negative numbers?

3. Negative Numbers Are Used to Measure Temperature

4. Negative Numbers Are Used to Measure Under Sea Level 0 10 20 30 -10 -20 -30 -40 -50

5. Negative Numbers Are Used to Show Debt Let’s say you wanted your parents to buy you a video game. They loaned you $50. You buy your game and enjoy it. However, you still owe Mom & Dad $50. Your current balance or debt is -$50.

6. Definition Positive number – a number greater than zero. 0123456

7. Definition Negative number – a number less than zero. 0123456-2-3-4-5-6

8. Definition Opposite Numbers – numbers that are the same distance from zero in the opposite direction 0123456-2-3-4-5-6

9. Positive & Negative Numbers Working with positive and negative numbers is like driving in traffic. You have to watch the traffic signs and follow the driving rules.

10. Solve the Problems -3 + -5 = 4 + 7 = (+3) + (+4) = -6 + -7 = 5 + 9 = -9 + -9 = -8 -18 14 -13 7 11

11. Addition Rules Rule #1 – If the signs are the same, pretend the signs aren’t there. Add the numbers together and re-attach the sign you started with. 9 + 5 = 14 -9 + -5 = -14

12. Solve the Problems 3 + -5 = -4 + 7 = (3) + (-4) = -6 + 7 = 5 + -9 = -9 + 9 = -2 0 -4 1 3

13. Integer Addition Rules Rule #2 – If the signs are different, subtract the two numbers and take the sign of the larger number. -9 + 5 = 9 - 5 = 4 Larger number Answer = - 4

14. Independent Practice Math Journal p. 232-233 Once finished, you can try the Math challenge games on Mr. Russo's WebsiteMr. Russo's Website