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Lesson # 32

Lesson # 32. Adding and Subtracting Integers. Wanna be “smartless”?. If not Pay Attention !. We have already learned how to…. Add and subtract positive (+) and negative (-) integers…. But sometimes it is nice…. To get a little review. So let us review the rules. If we are adding two

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Lesson # 32

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  1. Lesson # 32 Adding and Subtracting Integers

  2. Wanna be “smartless”? If not Pay Attention !

  3. We have already learned how to… Add and subtract positive (+) and negative (-) integers…

  4. But sometimes it is nice… To get a little review.

  5. So let us review the rules If we are adding two “ + ” numbers. Then we add and we will get another larger “ + ” number

  6. If we are adding two “ - ” numbers… Then we add the two numbers and the answer is a “ - ” number

  7. But what if we are adding one “ + ” and one “ - ” number? Well then we take the sign of the largest number and subtract.

  8. What about subtracting… If both numbers are “ + ” Then +a – +b = +c If a > b Or +a – +b = -c If a < b

  9. If both numbers are both “ - ”… Then -a - -b Is the same as saying -a + +b So we take the sign of the largest and subtract.

  10. Let’s look at when one number is “ + ” and one is “ - ” If the first number is “ + ” and the second number is “ - ” +a - -b This is the same as +a + +b So we simply add!

  11. If the first is “ - ” and the second is “ + ” then…-a - +b is the same as-a + -b so we add the numbers and the answer is “ - ”

  12. Lets try a few examples…How about -2 + -7 = ? That would be -9

  13. Let’s try -15 + +6 = ? Well if we take the sign of the largest and then subtract the two numbers that would be… -9

  14. Let’s try a few subtraction examples…How about -8 - -2remember that is the same as-8 + +2which is… -6

  15. Don’t forget… If a number does not have a sign in front of it then it is a “ + ” number.

  16. Have you got it?Good, you got it…Now you are ready for10 Practice questions!

  17. Question # 1 +13 + +7

  18. Question # 2 -25 + -15

  19. Question # 3 +15+ -30

  20. Question # 4 -20 + +5

  21. Question # 5 +45 + -20

  22. Question # 6 +100 - +150

  23. Question # 7 -50 - -30

  24. Question # 8 -14 - -2

  25. Question # 9 -12 - +12

  26. Question # 10 +2 - -4 - +2 + +4

  27. And now the answers. Prepare Yourself !

  28. Question # 1 +13 + +7 =+20

  29. Question # 2 -25 + -15 = -40

  30. Question # 3 +15+ -30 = -15

  31. Question # 4 -20 + +5 = -15

  32. Question # 5 +45 + -20 =+25

  33. Question # 6 +100 - +150 =-50

  34. Question # 7 -50 - -30 = -20

  35. Question # 8 -14 - -2 = -12

  36. Question # 9 -12 - +12 = -24

  37. Question # 10 +2 - -4 - +2 + +4 = +8

  38. Almost…The End

  39. Remember… People do not wake up one morning and know how to tie their shoes! It takes Practice!

  40. Now… The End

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