1. Problem-Solving Heuristics in Mathematics Dr Yeap Ban Har Marshall Cavendish Institute Singapore [email_address] www.banhar.com Photo Credit : Students solving a mathematics problem using draw-a-diagram heuristic at Da Qiao Primary School.
2. “ Mathematics is an excellent vehicle for the development and improvement of a person’s intellectual competence ...” Singapore Ministry of Education 2006
4. Heuristic: Model Method In a basket, 5/9 of the fruits are apples and the rest are oranges. 3/10 of the apples are green in colour. There are 15 green apples. How many fruits are there in the basket? Source: Primary School Leaving Examination 2006 – 2010
5. The Bar Model Method In a basket, 5/9 of the fruits are apples and the rest are oranges. 3/10 of the apples are green in colour. There are 15 green apples. How many fruits are there in the basket? Source: Primary School Leaving Examination 2006 – 2010 15 3 units = 15 1 units = 5 18 units = 18 x 5 = 90 There are 90 fruits in the basket.
15. 88 – 34 = 54 54 – 34 = 20 34 – 20 = 14 14 2 units = 14 3 units = 14 ÷ 2 x 3 = 21 21 girls wore goggles on that day.
16. Method 1 Guess and Check / Make a Table Method 2 Using Number Sentences $25 + $2 = $27 $27 : $3 = 9 There were 10 children. Total amount = $8 x 10 + $25 = $105 So each child received $105 : 10 = $10.50 Number of Children 3 $22 + $6 = $28 $24 + $25 = $49 4 … .
17. Method 1 Guess and Check / Make a Table 30 – 3 = 27 5 x 27 = 135 135 : 3 = 45 There were 45 books on each shelf at first.