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by Elaine Ernst Schneider September 28, 2000
PreClass Assignment: Review/ completion of Algebra Lesson 8 Resources/Equipment/Time Required: Outline: Different kinds of numbers are used to stand for different things. There are positive numbers and there are negative numbers. Positive numbers are more than zero and negative numbers are less than zero. The
best way to "see" negative and positive numbers is to look at a number
line:
/_____/_____/_____/_____/_____/_____/_____/_____/_____/_____/_____/_____/_____/_____/ 7
... 6 ..... 5 .... 4 ...... 3 ...... 2 ..... 1 ..... 0 ...... 1
......
2 ...... 3 ...... 4 ...... 5 ...... 6 ...... 7
When you use a number line, you add positives as you go to the right and you add negatives as you move to the left. For example, 3 + 2 means that you start at 3 and move two places to the left. The answer is 1. To add a positive to a negative, you work from left to right. For example, 4 + 3 is 1. You get that by starting at 4 and moving three places to the right. To add two negatives, move to the left. For example, 1 + 3 = 4. You arrive at that answer by starting at 1 and counting three places to the left. Assignment(s) including Answer key: Now you try: 1. 1 + 1
Now try a few that are beyond the scope of the number line shown above. You can do it! Just use the principles you have learned.
ANSWERS: 1.
0
17 PreRequisite To: Algebra Lesson 10 
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