1. Interesting Integers!

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

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

4. Definition Integers – are all of the whole numbers on the number line including zero.

5. Negative Numbers Are Used to Measure Temperature

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

7. Negative Numbers Are Used to Show Debt Let’s say your parents bought a car but had to get a loan from the bank for $5,000. When counting all their money they add in -$5.000 to show they still owe the bank.

8. Hint If you don’t see a negative or positive sign in front of a number it is positive. 9 +

9. Integer Addition Rules Rule #1 – If the signs are the same it means plus! 9 + + 5 = 14 9 - -5 = 14

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

11. Check Your Answers 1. 8 + 13 =21 2. –22 + -11 = -33 3. 55 + 17 =72 4. –14 + -35 = -49

12. Integer Addition Rules Rule #2 – If the signs are different pretend it means minus 9 + -5 = 9 - 5 = 4 Larger abs. value Answer = 4

13. Solve These Problems 3 + -5 = -4 + 7 = (+3) + (-4) = -6 + 7 = 5 + -9 = -9 + 9 = -2 5 – 3 = 2 0 -4 1 3 9 – 9 = 0 9 – 5 = 4 7 – 6 = 1 4 – 3 = 1 7 – 4 = 3

14. Check Your Answers 1. –12 + 22 =10 2. –20 + 5 = 15 3. 14 + (-7) = 7 4. –70 + 15 = -55

15. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 When the number is positive, count to the right. When the number is negative, count to the left. +-

16. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 + - +3 + -5 =-2

17. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 + - +6 + -4 =+2

18. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 + - +3 + -7 =-4

19. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 - + -3 + +7 =+4

20. Here are some more examples. 12 – (-8) 12 + (+8) 12 + 8 = 20 -3 – (-11) -3 + (+11) -3 + 11 = 8

21. Check Your Answers 1. 8 – (-12) = 8 + 12 = 20 2. 22 – (-30) = 22 + 30 = 52 3. – 17 – (-3) = -17 + 3 = -14 4. –52 – 5 = -52 + (-5) = -57