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
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)
35. w + a + c = 180z 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.