1. Algebra 1 Notes: Lesson 2-2 Rational Numbers

2. Visualize or Draw a Number line to help + means right - means left

3. Example 1
Add:
6 + (-14)

4. Example 1
Add:
6 + (-14) = -8
-¾ + (-½)

5. Example 1
Add:
6 + (-14) = -8
-¾ + (-½) = -1¼

6. Subtraction of Rational Numbers
To subtract a rational number, add its additive inverse.
8 – 15 = 8 + (-15)
-7.6 – 12.3 = (-12.3)

7. Example 2
Rewrite as an addition problem, then add:
-19 – 8

8. Example 2
Rewrite as an addition problem, then add:
-19 – 8 = (-8)

9. Example 2
Rewrite as an addition problem, then add:
-19 – 8 = (-8) = -27
67.1 – (-38.2)

10. Example 2
Rewrite as an addition problem, then add:
-19 – 8 = (-8) = -27
67.1 – (-38.2) =

11. Example 2
Rewrite as an addition problem, then add:
-19 – 8 = (-8) = -27
67.1 – (-38.2) = = 105.3

12. Multiplication and Division of Integers
Same Signs Multiply or divide as usual; the solution is positive.
Different Signs Multiply or divide as usual; the solution is negative.

13. Example 3
Multiply or Divide:
(-8)(-6)

14. Example 3
Multiply or Divide:
(-8)(-6) = 48

15. Example 3
Multiply or Divide:
(-8)(-6) = 48
-108 =

16. Example 4
Simplify:

17. Example 5
Simplify:

18. Assignment
Worksheet: Rational Numbers