Thursday, April 1, 2010

Mathematical Blogging 1

Topic: Multiplication of 6, 7, 8 and 9

Question L:

Billy wrote this in his book.

5 x 6 = 30
So, 7 x 6 = 30 + 6
= 36

Explain the mistake in Billy’s solution and obtain the correct answer.


Question M:

Billy wrote this in his book.

10 x 6 = 60
So, 9 x 6 = 60 + 6
= 66

Explain the mistake in Billy’s solution and obtain the correct answer.


Question H:

Without using vertical multiplication,
how would you solve 22 x 6 if you are given 10 x 6 =60?
Posted by at

47 comments:

  1. jeronApril 8, 2010 at 7:31 PM

    Question L:
    6 x 6 = 36; 7 x 6 = 42
    so 7 x 6 = 30 + 6 + 6 = 42
    Jeron

    ReplyDelete
  2. ErnestApril 8, 2010 at 7:42 PM

    Question H:
    10 x 6 = 60 so 20 x 6=120 120 + 12=132




    Ernest

    ReplyDelete
  3. l30n.t1yApril 8, 2010 at 7:51 PM

    I don't have a google account

    ReplyDelete
  4. kelvinApril 8, 2010 at 7:52 PM

    Question M:
    10x6=60
    So 9x6=60-6=54

    ReplyDelete
  5. TracyApril 8, 2010 at 7:52 PM

    Question L:
    10x6=60
    60+6=66.
    If 9x6=66,
    it will be more than 10x6.
    10 is more than 9
    so 9x6 should be less than 10x6.
    which will be 54.

    ReplyDelete
  6. Durratun NafisahApril 8, 2010 at 7:53 PM

    Question M,
    1 x 6 = 6, 2 x 6 =12, 3 x 6= 18, 4 x 6 = 24,
    5 x 6= 30, 6 x 6 = 36, 7 x 6 = 42, 8 x 6 =48, 9 x 6 = 54, 10 x 6 =60.He is not surpose to + but to - then he will get the answer!!!! So the answer was 54. So that was he's mistake!!!

    ReplyDelete
  7. KeeneApril 8, 2010 at 7:54 PM

    Question M:

    10 x 6 = 60

    9 x 6 = 54

    So, 60 - 6 = 54

    ReplyDelete
  8. AnonymousApril 8, 2010 at 7:56 PM

    Question M:

    9 x 6=54
    so,30 + 24 = 54

    ReplyDelete
  9. UnknownApril 8, 2010 at 7:57 PM

    Question M:
    10x6=60 9x6=54
    so,9x6=60-6
    Question H:
    10x6=60 20x6=120 2x6=12
    so120+12=132

    ReplyDelete
  10. chen weiApril 8, 2010 at 7:57 PM

    Question M:10x6=60 So 9x6=60-6=54 Goh Chen Wei

    ReplyDelete
  11. BalqisApril 8, 2010 at 7:58 PM

    10 x 6 = 60 9 x 6 = 54

    ReplyDelete
  12. l30n.t1yApril 8, 2010 at 7:59 PM

    Question L:
    5 x 6 = 30;7 x 6 = 42 So,30 + 6 + 6 = 42

    ReplyDelete
  13. kelvinApril 8, 2010 at 7:59 PM

    Question H:
    60+60=120
    120+12=132
    22x6=132

    ReplyDelete
  14. TracyApril 8, 2010 at 7:59 PM

    sorry but my question should be m not L.

    ReplyDelete
  15. sum yinApril 8, 2010 at 7:59 PM

    Question M:
    10 x 6 = 60; 9 x 6 = 54
    So,9 x 6 = 60 + 6 + 6
    =54
    Question H:I will use 20 x 6 = 120 2 x 6 = 12
    120 + 12 = 122
    The answer is 122.

    ReplyDelete
  16. warlord9963April 8, 2010 at 8:01 PM

    Question M:10 x 6 =60

    ReplyDelete
  17. Hui RuApril 8, 2010 at 8:02 PM

    Question M:
    10x6=60
    60-6=54

    ReplyDelete
  18. Agnes Sum Wen XuanApril 8, 2010 at 8:02 PM

    Question L:5 x 6 =30; 7 x 6 = 42.
    So 7 x 6 = 30 + 6 + 6
    =42

    ReplyDelete
  19. chen weiApril 8, 2010 at 8:03 PM

    Question H:
    2x60=120 6+6=12 so 120+12=132 GOH CHEN WEI

    ReplyDelete
  20. Tan Li TongApril 8, 2010 at 8:04 PM

    Question M:
    10 x 6 =60 so, 9 x 6 = 51 so, 51 + 9 = 60

    ReplyDelete
  21. BalqisApril 8, 2010 at 8:04 PM

    Question H:

    10 x 6 = 60 so.... 20 x 6 =120 120+12=132!

    ReplyDelete
  22. Yu hanApril 8, 2010 at 8:05 PM

    Question M:
    9 x 6 = 54
    10 x 6 = 60 -6 =54
    So,9 x 6 = 54

    Question H:
    22 x 10 =220
    220+6=226

    ReplyDelete
  23. angjerlin2001April 8, 2010 at 8:05 PM

    Question L:
    5x6=30 6x6=30+6 7x6=30+6=6

    ReplyDelete
  24. AnonymousApril 8, 2010 at 8:06 PM

    Question H:
    10x6=60,11x6=66,12x6=72,13x6=78,14x6=84,15x6=90,16x6=96,17x6=102,18x6=108,19x6=114,20x6=120,21x6=126 and 22x6=132

    so,22x6=132

    ReplyDelete
  25. Durratun NafisahApril 8, 2010 at 8:07 PM

    Question H:
    6 x 10 = 10 so 20 x 6 = 120 + 10 + 2 =132. So the answer is 132!

    ReplyDelete
  26. KeeneApril 8, 2010 at 8:07 PM

    Question H:

    22 x 6 =132

    132 - 60 = 72

    ReplyDelete
  27. AnonymousApril 8, 2010 at 8:07 PM

    Question L

    5x6=30;7x6=42
    30+6+6=42

    Stanic

    ReplyDelete
  28. Hui RuApril 8, 2010 at 8:08 PM

    Question H:
    10x6=60
    10x6=60+60=120
    2x6=12+120=132

    ReplyDelete
  29. kong minApril 9, 2010 at 12:14 AM

    Question M:

    10x6=60;9x6=54
    So,9x6=60-6=54

    Question H:

    10x6=60 20x6=120 6x2=12
    So,120+12=132

    ReplyDelete
  30. Lee Hui XinApril 9, 2010 at 2:55 AM

    Question M:
    10x6=60
    6x6=36
    So,36+6=42

    ReplyDelete
  31. Lee Hui XinApril 9, 2010 at 2:59 AM

    Question M:
    10x6=60
    so,60-6=54

    ReplyDelete
  32. Lee Hui XinApril 9, 2010 at 3:10 AM

    Question H:
    10x6=60+6+6+6+6+6+6+6+6+6+6+6+6=60+72=132

    ReplyDelete
  33. AnonymousApril 9, 2010 at 6:05 AM

    Question M :
    10 x 6 = 60
    9 x 6 = 60 - 6
    60 - 6 = 54
    So, 9 x 6 = 54

    Jocelyn Sia
    P3A

    ReplyDelete
  34. AnonymousApril 9, 2010 at 6:12 AM

    Question H:
    10 x 6 = 60

    22 - 10 = 12

    12 x 6 = 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6

    6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 = 72

    12 x 6 = 72

    So, 72 + 60 = 132

    Jocelyn Sia

    ReplyDelete
  35. AnonymousApril 9, 2010 at 7:19 AM

    Question M :
    10x6=60 60-6=54=9x6=54 so 9x6=54





    andrew 3A

    ReplyDelete
  36. UnknownApril 9, 2010 at 7:29 AM

    Question H:
    10x6=60 20x6=120=60+60=120 2x6=12 so 120+12=132

    ReplyDelete
  37. AnonymousApril 10, 2010 at 8:59 PM

    Question M:

    9x6=54 10x6=60
    So,60-6=54

    Stanic

    ReplyDelete
  38. AnonymousApril 10, 2010 at 9:09 PM

    Question H:

    10x6=60 So,20x6=120

    120+12=132

    ReplyDelete
  39. Siti PhangApril 10, 2010 at 10:22 PM

    Question H:
    20x6=120
    21x6=126
    So,22x6=132

    ReplyDelete
  40. AnonymousApril 11, 2010 at 2:34 AM

    Question M:

    10 x 6 = 60
    9 x 6 = 53
    So, 9 x 6 = 60 - 6 = 53

    Question H:

    10 x 6 = 60
    20 x 6 = 120
    2 x 6 = 12
    So, 120 + 6 = 132

    ReplyDelete
  41. ang jer linApril 11, 2010 at 4:17 AM

    Question M:
    10x6=60
    So,9x6=60-6
    =54

    ReplyDelete
  42. ang jer linApril 11, 2010 at 4:25 AM

    Question H:
    10x6=60
    10x6=60
    2x6=12
    So,60+60+12=132

    ReplyDelete
  43. AnonymousApril 13, 2010 at 5:39 AM

    Question H:
    10 x 6 =60

    10 x 6 = 60

    2 x 6 =12


    then,60 + 60 + 12 =132. so,22 x 6 =132

    ReplyDelete
  44. MabelApril 13, 2010 at 5:47 AM

    Question H:
    10 x 6 =60

    10 x 6 = 60

    2 x 6 = 12

    then,60+60+12=132.so,22 x 6 =132.

    ReplyDelete
  45. MabelApril 13, 2010 at 5:54 AM

    Question H:
    10x6=60
    10x6=60
    2x6=12
    Then, 60+60+12=132
    So, 22x6=132.

    ReplyDelete
  46. MalcolmApril 15, 2010 at 12:10 AM

    Question H :
    22 x 6 = 22 groups of 6

    then, 22 x 6= 10x6 + 10x6 + 2x6
    = 60 + 60 + 12 = 120 +12
    =132

    ReplyDelete
  47. UnknownApril 15, 2010 at 1:11 AM

    Question L:

    9 x 6 = 9 groups of 6
    so 9x6 = 10 groups of 6 - 1 group of 6
    = 10x6 - 1x6
    = 60 - 6 = 54

    ReplyDelete

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