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# Positive and negative numbers

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### Positive and negative numbers

1. 1. PositiveandNegativeNumbers<br />
2. 2. What is…<br />
3. 3. … a positive number?<br />A number that is greater than zero<br />
4. 4. … a negative number?<br />A number that is less than zero.<br />
5. 5. …an opposite number?<br />Numbers that are the same distance from zero in the opposite direction.<br />
6. 6. …an integer?<br />All whole numbers and their opposites on a number line<br />9 opposite -9<br />
7. 7. This is a number line<br />negative<br />positive<br />
8. 8. Using positive and negative numbers…<br />Is like driving in traffic. You have to watch for the signs!<br />
9. 9. This is the positive sign!<br />
10. 10. This is the negative sign!<br />
11. 11. Hint:<br />If you don’t see a sign in front of a number, don’t panic! No sign means it is a positive number!<br />
12. 12. Addition Rules<br />If the signs are the same, cross them out and pretend they are not there and add as you normally would.<br />After adding the numbers together, place the sign in front of the answer.<br />
13. 13. Adding Integers with the same sign:<br />Take away the signs and get this:<br />3+5=8<br />
14. 14. Rule # 2:<br />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.<br />
15. 15. For Example:<br />Subtract the numbers normally and add the sign of the largest number:<br />5-3=2 add sign =-2<br />
16. 16. Solve these problems:<br />3+-8<br />5+-9<br />-8+-2<br />9+9<br />-5+-9<br />3+9<br />-7+4<br />10+-4<br />
17. 17. One way to add numbers is by using the number line.<br />
18. 18. When a number is positive, count to the right<br />
19. 19. When a number is negative, count to the left<br />
20. 20. Now we’re all pros at adding positive and negative numbers!<br />