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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.

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### RGPS Seminar for Parents (Revised)

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