Scribe Post

Monday, October 27, 2008
Today in math we learned how to subtract integers. We also found out that subtraction is a myth. To subtract integers, you have to add the opposite.





For example:









For homework we had to do p.46 A. (1-45). We had to answer three questions using algebra tiles.





For example:






Here are the questions and answers for p.46 A.





1. (-8)-(+2) 2. (-9)-(+3)


(-8)+(-2)= -10 (-9)+(-3)= -12




3. (-10) -(+5) 4. (-8)-(-3)




(-10)+(-5)= -15 (-8)+(+3)= -5




5. (-7)-(+7) 6. (-4)-(-6)




(-7)+(-7)= -14 (-4)+(+6)= 2


7. (-3)-(+3) 8. (-5)-(-9)




(-3)+(-3)= -6 (-5)+(+9)= 4





9. (-9)-(-12) 10. (-12)-(+18)




(-9)+(+12)= 3 (-12)+(-18)= -30


11. (-8)-(+4) 12. (+4)-(-9)


(-8)+(-4)= -12 (+4)+(+9)= 13


13. (+6)-(-12) 14. (-9)-(-15)


(+6)+(+12)= 18 (-9)+(+15)= 6


15. (-15)-(+6) 16. (+15)-(+6)


(-15)+(-6)= -21 (+15)+(-6)= 9


17. (+4)-(-3)


(+4)+(+3)=7






18. (+3)-(-2)



(+3)-(+2)= 5



19. (-5)-(-7) 20. (-2)-(+4)


(-5)+(+7)=2 (-2)+(-4)= -6


21. (-19)-(-18) 22. (+10)-(+19)


(-19)+(+18)= -1 (+10)+(-19)= -9


23. (-17)-(+23) 24. (+11)-(+14)


(-17)+(-23)= -30 (+11)+(-14)= -3


25. (+10)-(-16) 26. (+13)-(-12)


(+10)+(+16)= 26 (+13)+(+12)= 25


27. (-15)-(+6) 28. (-18)-(+14)


(-15)+(-6)= -21 (-18)+(-14)= -32


29. (0)-(-15) 30. (-13)-(+12)


(0)+(+15)= 15 (-13)+(-12)= -25


31. (+7)-(+3) 32. (-6)-(-3)


(+7)+(-3)= 4 (-6)+(+3)= -3


33. (-8)-(-6) 34. (+6)-(-3)


(-8)+(+6)= -2 (+6)+(+3)= 9


35. (-7)-(-8) 36. (-4)-(+2)


(-7)+(+8)= 1 (-4)+(-2)= -6


37. (+4)-(+2) 38. (-3)-(-14)


(+4)+(-2)=6 (-3)+(+14)= 11


39. (-3)-(+5) 40. (+8)-(-6)


(-3)+(-5)= -8 (+8)+(+6)= 14


41. (+5)-(-8) 42. (-8)-(+2)


(+5)+(+8)= 13 (-8)+(-2)= -10


43. (+7)-(-9) 44. (-8)-(+6)


(+7)+(+9)= 16 (-8)+(-6)= -14


45. (-7)-(-9)


(-7)+(+9)= 2


Here is a video on how to subtract integers:





4 comments:

  1. courtneyc 8-17 said...

    goood job ella .
    (:

    October 27, 2008 at 8:06 PM  

  2. NickyD817 said...

    Good job Jowella. Only one little thing I have to point out...there are a lot of spaces which probably aren't your fault anyways.

    October 27, 2008 at 9:57 PM  

  3. tammra817 said...

    Great job Jowella
    I like the video!
    :)

    October 28, 2008 at 8:26 AM  

  4. Liem 8-17 said...

    Dammit, Good job. I guessed on that day I didn't have to do my h.w, just copy off yours. Well done and good explaining on some of your answers. Keep it up:)

    October 29, 2008 at 8:43 PM  

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