This session focused on mathematical problem solving - an important aspect of Singapore Mathematics curriculum.

1. singaporemathinaction Session 3 mathematical problem solving Yeap Ban Har National Institute of Education Singapore www.banhar.com

2. singaporemathinaction

3. singaporemathinaction Problem 1 How many paper clips are there in the box on your table?

4. singaporemathinaction Problem 2 Arrange the cards so that you can do the card trick shown to you.

5. singaporemathinaction Problem 3 How many three-fourths are there in 1 whole?

6. Ateneo Grade School, Manila How many three-fourths are there in one whole?

7. singaporemathinaction - Problem 4 Give a 3-digit number and a 2-digit number so that the difference is 3. 3

8. singaporemathinaction + Problem 5 Use one set of digit tiles to make a correct addition sentence.

9. singaporemathinaction + Problem 6 Use one set of digit tiles to make a correct addition sentence.

10. singaporemathinaction x Problem 7 Use one set of digit tiles to make a correct multiplication sentence.

11. Solutions from Participants 45 x 2 = 90 18 x 2 = 36 16 x 3 = 48 43 x 2 = 86 13 x 4 = 52 17 x 2 = 34 14 x 5 = 70 26 x 3 = 78 15 x 6= 90 29 x 3 = 87 34 x 2 = 68 12 x 5 = 60 13 x 6 =78 35 x 2 = 70 48 x 2 = 96 16 x 5 = 80 12x 8 = 96 15 x 4 = 60 19 x 2= 38 27 x 3 = 81 15 x 2 = 30 17 x 4 = 68 12 x 7 = 84 19 x 3 = 57 Why are there so few odd products?

12. Shaping MathsCoursebook 4A

13. singaporemathinaction 614 Two Numbers 2 units  614 4 units  1228 The sum of the two numbers is 1228. Shaping MathsCoursebook 4A

14. singaporemathinaction boys 342 50 girls Boys & Girls 2 units  342 – 50 = 292 1 unit  292 ÷ 2 = 140 + 6 = 146 There are 146 Primary Four boys. Shaping MathsCoursebook 4A

15. singaporemathinaction Ravi 1775 + 85 Samuel Stamps After 1 unit  1860 ÷ 4 = 465 At first, Samuel had 465 – 85 = 380 stamps. Shaping MathsCoursebook 4A

16. 1860 1600 260 240 20 Keys Grade School, Manila

18. Plan

19. Do

21. singaporemathinaction What are some of the methods used to solve the problems? Make a list of heuristics used. Heuristics