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RGPS Seminar for Parents (Revised)
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RGPS Seminar for Parents (Revised)

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This is the presentation made to 200 parents in Raffles Girls' Primary School in Singapore. It was organized by the alumni members.

This is the presentation made to 200 parents in Raffles Girls' Primary School in Singapore. It was organized by the alumni members.

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  • Thanks for the revised slides. Just to check on Problem 8, think the answer should be 34.
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  • 1. Using The Model Method to Solve Word Problems
    DrYeap Ban Har
    Marshall Cavendish Institute
    Singapore
    Slides are available at www.banhar.blogspot.com
    CollegioDagoberto Godoy, Santiago de Chile
  • 2. The Curriculum (Ministry of Education 2006)
  • 3. emphasis
    thinking
    The Curriculum (Ministry of Education 2006)
  • 4. emphasis
    visualization
  • 5.
  • 6.
  • 7. Experiencing
    Singapore Math
  • 8.
  • 9. Experiencing
    Singapore Math
  • 10. Experiencing
    Singapore Math
  • 11.
  • 12.
  • 13. Kyla
    ?
    $28 – $9 = $19
    Kyla has $19.
    Jake
    ?
    $9
    $28
  • 14. Ming
    48
    Naomi
    48 ÷ 4 = 12
    3 x 12 = 36
    Ming has 36 candies.
  • 15. 15
    3 units  15
    18 units  6 x 15 = 90
    apples
    There are 90 fruits in the basket.
  • 16. Method 1
    3 units  15
    18 units  6 x 15 = 60 + 30 = 90
    18 units  6 x 15 = 3 x 30 = 90
    Method 2
    3 units  15
    1 unit  5
    18 units  18 x 5 = 50 + 40 = 90
    18 units  18 x 5 = 180 ÷ 2 = 90
  • 17. Allan’s allowance = 4 x $8 = $32
    $24 ÷ 3 = $8
    $6
    $18
  • 18. Mon
    Tue
    $3
    $100
    Wed
    $3
    $3
    Thu
    $3
    $3
    $3
    $100 – 6 x $3 = $82
    $82 ÷ 4 = $20.50
    $20.50 + 3 x $3 = $29.50
    She saved $29.50 on Thursday.
  • 19. adults
    children
    2 units  380 – 260 = 120
    1 unit  60
    260 – 60 = 200
    200 + 200 = 400
    400 people left at lunchtime.
  • 20. apples
    90
    oranges
    38
    pears
    15
  • 21. apples
    90
    oranges
    pears
    15
    23
  • 22. 90 + 15 = 105
    5 units 
    1 unit  105 ÷ 5 = 21
    There were (21 + 21 + 23) apples, hence oranges.
    There were 44 oranges used.
    apples
    ?
    oranges
    pears
    15
    23
  • 23. What if we have drawn 38 to be much longer?
    apples
    90
    oranges
    38
    pears
    15
  • 24. What if we have drawn 38 to be much longer?
    apples
    105
    oranges
    38
    pears
    We still get 5 units  105
  • 25. One other way to solve it …
    Number of oranges left = x
    Number of apples left = 2x
    Number of pears left = 2x – 15
    x + 2x + 2x – 15 = 90
    5x = 105
    x = 21
    Number of pears left = 2 x 21 – 15 = 27
    Number of pears at first = 38 + 27 = 65
    Number of oranges at first = 65
    Number of oranges used = 65 – x = 65 – 21 = 44
  • 26. 18%
    342
    24%
    76%
    76%  342
    Mr Wong had 450 books at first.
    1%  4.5
    100%  450
  • 27. Xueling + Siti (64)
    Jane (16)
    (24 – 16) units = 8 units
    8 units = 14 shells
    40 units = 5 x 14 shells
    40 units = (50 + 20) shells
    Xueling collected 70 shells.
    Jane + Xueling
    Siti
    (24)
    (40)
  • 28. This problem requires the ability to visualize.
  • 29. x + b + d = 180
    b
    x
    d
  • 30. y
    e
    y + c + e = 180
    c
  • 31. a
    e
    b
    x
    y
    By the same logic:
    z
    w
    v
    d
    c
    2a + 2 b + 2c + 2d + 2e + x + y + z + v + w = 5 x 180
    x + y + z + v + w = 3 x 180
    Hence, a + b + c + d + e = 180
  • 36. Using The Model Method to Solve Word Problems
    DrYeap Ban Har
    Marshall Cavendish Institute
    Singapore
    Slides are available at www.banhar.blogspot.com
  • 37. Mani has 245 ten-cent coins and 455 five-cent coins. Nina has 165 ten-cent coins and 135 five-cent coins. After Mani gives Nina some coins, of Mani’s coins are ten-cent ones and the ratio of the number of Nina’s five-cent coins to the number of her one-cent coins is 3 : 2.
    They have only five-cent and one-cent coins.
    Using The Model Method to Solve Word Problems
    Slides are available at www.banhar.blogspot.com
    Post Your Solutions on MCI’s Facebook
    Find the number of coins Mani gives to Nina.