Sunday, July 29, 2012

S2 Maths Supplements :) Yummy!!

Maths Supplements continues ...

S2:

Seth has some small rubber balls. If he puts them into groups of 5, he would have 1 ball left. If he puts them into groups of 7, he would be short of 2 rubber balls. What is the smallest number of rubber balls he could have?


Have fun! :)

Please try the sum! :)
Mrs R
Posted by at

64 comments:

  1. UnknownJuly 30, 2012 at 12:06 AM

    This comment has been removed by the author.

    ReplyDelete
  2. Nicholas TanJuly 30, 2012 at 12:06 AM

    my answer is 26 small rubber balls.

    ReplyDelete
  3. UnknownJuly 30, 2012 at 12:07 AM

    My answer is 26.

    Hope I'm not wrong. :)

    ReplyDelete
  4. heyiJuly 30, 2012 at 12:07 AM

    My answer is-26 rubber balls




    Am i corret?

    ReplyDelete
  5. Wei KiatJuly 30, 2012 at 12:09 AM

    My answer is 26.

    ReplyDelete
  6. UnknownJuly 30, 2012 at 12:09 AM

    26

    ReplyDelete
  7. wh4tthefriesJuly 30, 2012 at 12:10 AM

    Hey, I've got 26 rubber balls! I mean Seth has 26 rubber balls.

    ReplyDelete
  8. UnknownJuly 30, 2012 at 12:10 AM

    My ans:26 rubber balls

    ReplyDelete
  9. RyanLauJuly 30, 2012 at 12:10 AM

    26 balls.

    ReplyDelete
  10. UnknownJuly 30, 2012 at 12:10 AM

    My answer is 26 small rubber balls.

    ReplyDelete
  11. UnknownJuly 30, 2012 at 12:10 AM

    Seth has 26 small rubber balls. o.O

    ReplyDelete
  12. NadineJuly 30, 2012 at 12:10 AM

    26 balls

    ReplyDelete
  13. UnknownJuly 30, 2012 at 12:13 AM

    I found the answer 26 Yeah

    ReplyDelete
  14. An shengJuly 30, 2012 at 12:14 AM

    I got 26 balls!Oops.Haha!

    ReplyDelete
  15. UnknownJuly 30, 2012 at 12:14 AM

    it is 26

    ReplyDelete
  16. madhuJuly 30, 2012 at 12:16 AM

    ANSW:26 small rubber balls

    ReplyDelete
  17. Jia XianJuly 30, 2012 at 12:16 AM

    The answer I got for this question is 26 rubber balls.

    ReplyDelete
  18. jiayiJuly 30, 2012 at 12:17 AM

    it is 26 balls.

    ReplyDelete
  19. UnknownJuly 30, 2012 at 12:19 AM

    Um, it is 26.

    ReplyDelete
  20. glenda hoJuly 30, 2012 at 12:19 AM

    it is 26 balls

    ReplyDelete
  21. UnknownJuly 30, 2012 at 12:20 AM

    This comment has been removed by the author.

    ReplyDelete
  22. Ginwen~July 30, 2012 at 12:21 AM

    how do u get 26? :( I don't get it!
    My working:
    2+1=3
    7-5=2
    3 divide by 2= ? (cannot divide!)
    Please help!

    ReplyDelete
    Replies
    1. NicholasJuly 31, 2012 at 2:32 AM

      5,10,15,20,25,30,35,40,45,50.
      6,11,15,21,26,31,36,41,46,51.
      ANS!
      7,14,21,28,35,42,49,56,63,70.
      5,12,19,26,33,40,47,54,61,68.
      ANS!

      Delete
    2. Ginwen~July 31, 2012 at 11:50 PM

      BIG THANKS TO U! I understand! :)

      Delete
  23. UnknownJuly 30, 2012 at 12:21 AM

    Seth has 26 rubber balls!B-)

    Chen Jing

    ReplyDelete
  24. arshwiniJuly 30, 2012 at 12:24 AM

    ans:26

    ReplyDelete
  25. K.AshwiniJuly 30, 2012 at 12:25 AM

    Seth has 26 rubber balls.

    ReplyDelete
  26. UnknownJuly 30, 2012 at 12:26 AM

    My ans:26 balls.I hope i'm not wrong but am just the opp. :)

    ReplyDelete
  27. Evelyn SeeJuly 30, 2012 at 6:08 AM

    My answer is 26 rubber balls. 8-)

    ReplyDelete
  28. Darren MokJuly 30, 2012 at 6:38 AM

    My answer is 26 balls.

    ReplyDelete
  29. PriscillaJuly 30, 2012 at 7:13 AM

    It is 26 rubber balls.

    ReplyDelete
  30. Ainul SariyahJuly 30, 2012 at 10:20 PM

    26 balls

    ReplyDelete
  31. NicholasJuly 31, 2012 at 2:32 AM

    5,10,15,20,25,30,35,40,45,50.
    6,11,15,21,26,31,36,41,46,51.
    ANS!
    7,14,21,28,35,42,49,56,63,70.
    5,12,19,26,33,40,47,54,61,68.
    ANS!

    ReplyDelete
  32. PriscillaJuly 31, 2012 at 2:47 AM

    Explanation:
    7-5=2
    6/5=1r1
    6/2=3 boxes
    3*7=21
    21+5=26 rubber balls

    ReplyDelete
    Replies
    1. SabarnaAugust 3, 2012 at 2:57 AM

      Where did you get your '6' from?
      Can you explain? :D

      Delete
  33. K.AshwiniJuly 31, 2012 at 2:51 AM

    5-5,10,15,20,25,35,40,45,50,55...........
    5+1-6,11,16,21,26,36,41,46,51,56...........

    7-7,14,21,28,32,40,48,56,63,70...........
    7-2-5,12,19,26,30,38,46,54,61,68...........


    Seth has 26 rubber balls.

    ReplyDelete
  34. glenda hoJuly 31, 2012 at 5:15 AM

    5,10,15,20,25,30,35,40,45,50.
    +1
    6,11,15,21,26,31,36,41,46,51.

    7,14,21,28,35,42,49,56,63,70.
    -2
    5,12,19,26,33,40,47,54,61,68.

    from here we see that the only common number among the line of numbers is 26. Therefore, 26 is the answer!:)

    ReplyDelete
  35. Jia XianJuly 31, 2012 at 5:39 AM

    Method:
    Using common number table

    My Working:
    5 10 15 20 25 30 35 40 45 50 55
    6 11 16 21 26 31 36 41 46 51 56

    7 14 21 28 35 42 49 56
    5 12 19 26 33 40 47 54

    The common number you should see is 26.

    Seth has 26 rubber balls.

    ReplyDelete
  36. HeyiJuly 31, 2012 at 6:06 AM

    My method is by multiples:

    5:5,10,15,20,25,30,35,40,45,50,55
    +1:6,11,16,21,26,31,36,41,46,51,56

    7:7,14,21,28
    -2:5,12,19,26

    As you can see,their common number is 26 so that's the answer.

    ReplyDelete
  37. AinulJuly 31, 2012 at 6:11 AM

    My Answer is:
    5: 5,10,15,20,25,30
    5=1: 6,11,16,21,26,31

    7: 7,14,21,28
    7-2:5,12,19,26

    So, the answer is 26 rubber balls.

    ReplyDelete
  38. jiayiJuly 31, 2012 at 6:32 AM

    this is my working:
    5=5,10,15,20,25,30,35,40,45

    +1=6,11,16,21,26,31,36,41,46

    7=7,14,21,28,35,42,49,56,63

    -2=5,12,19,26,33,40,47,54,61

    and the answer is 26 balls

    ReplyDelete
  39. UnknownJuly 31, 2012 at 7:04 AM

    same!

    ReplyDelete
  40. UnknownJuly 31, 2012 at 7:05 AM

    My working:

    5=5,10,15,20,25,30,35,40
    5(+1)=6,11,16,21,26,31,36,41

    For 7:

    7=7,14,21,28,35,42,49,56
    7(-2)=5,12,19,26,33,40,47,54

    The common is 26,thus it is the answer.

    ReplyDelete
  41. UnknownJuly 31, 2012 at 7:18 AM

    My working:


    5= 5,10,15,20,25,30
    5(+1)= 6,11,16,21,26,31

    7= 7,14,21,28,35,42
    7(-2)= 5,12,19,26,,33,40

    So the answer is 26. ( also my birthday date)

    ReplyDelete
    Replies
    1. UnknownJuly 31, 2012 at 11:09 PM

      my birthday date too!

      Delete
    2. wh4tthefriesAugust 1, 2012 at 1:14 AM

      Nandan, it looks like u have been copying Wei Xuan's answer. But, no offence! :)

      Delete
  42. UnknownJuly 31, 2012 at 11:57 PM

    m. of 5:5,10,15,20,25,30
    m.of5+1:6,11,16,21,26,31
    m. of 7:7,14,21,28,35
    m.of7-2:5,12,19,26,33
    ans:26

    ReplyDelete
  43. wh4tthefriesAugust 1, 2012 at 1:12 AM

    5:5,10,15,20,25,30,35
    +1:6,11,16,21,26,31,36

    7:7,14,21,28,35,42
    -2:5,12,19,26,33,40

    U will c that '26' is the common number, hence, the answer is 26.

    ReplyDelete
  44. Wei KiatAugust 1, 2012 at 1:49 AM

    I couldn't figure out how to use the.. other method (I forgot the name already) so here is my working:

    x5: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50
    +1: 6, 11, 16, 21, (26), 31, 36, 41, 46, 51
    x7: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70
    -2: 5, 12, 19, (26), 33, 40, 47, 54, 61, 68

    The answer is 26.

    ReplyDelete
  45. This Awkward Turtle Loves MusicAugust 1, 2012 at 2:17 AM

    Ans:26

    ReplyDelete
  46. Tan Li XinAugust 1, 2012 at 3:01 AM

    26 rubber balls

    ReplyDelete
  47. UnknownAugust 1, 2012 at 3:26 AM

    5,10,15,20,25
    +1 6,11,16,21,26

    7,14,21,28
    -2 5,12,19,26

    The common number is 26.
    So,Seth has 26 rubber balls.

    ReplyDelete
  48. Madhu :DAugust 1, 2012 at 3:45 AM

    5:5,10,15,20,25
    +1:6,11,16,21,26

    7:7,14,21,28
    -2:5,12,19,26

    The common no. is 26.
    Seth has 26 small rubber balls.

    ReplyDelete
  49. Dixon LowAugust 1, 2012 at 4:45 AM

    Multiples of 5: 5,10,15,20,25
    Multiples of 5+1: 6,11,16,21,26

    Multiples of 7: 7,14,21,28
    Multiples of 7-2: 5,12,19,26

    Common number=26

    Seth has 26 small rubber balls.

    ReplyDelete
  50. Darren MokAugust 1, 2012 at 5:23 AM

    5=5,10,15,20,25,30,35,40,45,50,55.......
    5+1=6,11,16,21,26,31,36,41,46,51,56.....

    7=7,14,21,28,35,42,49.......
    7-2=12,19,26,33,40,47.......

    Commom number:26

    ReplyDelete
  51. Nadine LeeAugust 1, 2012 at 5:29 AM

    Multiples of 5 - 5,10,15,20,25
    Multiples of 5+1 - 6,11,16,21,26

    Multiples of 7 - 7,14,21,28
    Multiples of 7-2 - 5,12,19,26

    The common number here is 26
    ANS: 26 balls

    ReplyDelete
  52. SabarnaAugust 5, 2012 at 3:08 AM

    My answer was '26' rubber balls.
    I couldn't use the 'no. of groups do not vary' method.
    So, I used this long method: (I decided to list numbers till 30)

    Multiples of 5 : 5, 10, 15, 20, 25, 30
    + 1 : 6, 11, 16, 21, (26), 31
    Multiples of 7 : 7, 14, 21, 28, 35
    - 2 : 5, 12, 19, (26), 33
    The common number: 26
    Seth has 26 rubber balls.

    ReplyDelete
  53. ShannonAugust 6, 2012 at 12:33 AM

    how to do?

    ReplyDelete
  54. Marc TayAugust 21, 2012 at 11:43 PM

    26 balls

    ReplyDelete

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