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# Positive and negative numbers

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### Transcript

• 1. PositiveandNegativeNumbers
• 2. What is…
• 3. … a positive number?
A number that is greater than zero
• 4. … a negative number?
A number that is less than zero.
• 5. …an opposite number?
Numbers that are the same distance from zero in the opposite direction.
• 6. …an integer?
All whole numbers and their opposites on a number line
9 opposite -9
• 7. This is a number line
negative
positive
• 8. Using positive and negative numbers…
Is like driving in traffic. You have to watch for the signs!
• 9. This is the positive sign!
• 10. This is the negative sign!
• 11. Hint:
If you don’t see a sign in front of a number, don’t panic! No sign means it is a positive number!
If the signs are the same, cross them out and pretend they are not there and add as you normally would.
• 13. Adding Integers with the same sign:
Take away the signs and get this:
3+5=8
• 14. Rule # 2:
If the signs are different, pretend they are the same and subtract the smallest number and add the sign of the largest number to your answer.
• 15. For Example:
Subtract the numbers normally and add the sign of the largest number: