### 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:

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