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# NSMI Core Elective on Challenging Problems

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Yeap Ban Har gave the Closing Keynote on Day 1 of the three-day institute.

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### NSMI Core Elective on Challenging Problems

1. 1. Core Elective 1 / 2Bar Modelsin Challenging Word Problems from Singapore SchoolsYeap Ban HarSlides are available atwww.banhar.blogspot.com
2. 2. key focus of singaporemathematics
3. 3. problem solving Learning Standards
4. 4. Escuela de Guetamala, Chile
5. 5. Pathlight School, Singapore
6. 6. 3x – 2 = 8Globe Academy, London
7. 7. Lesson  June 18, 2012Open Public Lesson, Hawaii
8. 8. Kim 2 Before After 3 Kim m m-2John 2 John m+3 m+3+2 ? John had 7 more sweets than Kim in the end.
9. 9. 4 units = 10012 units = 3 x 100 = 300Its capacity is 300 ml.
10. 10. 5 units = 550 1 units = 110May 4 units = 440Chris 1 part = 55Chris must give May 165 book marks. 3 parts = 3 x 55 = 150 + 15 = 165
11. 11. 48 minutes8 units = 48 minutes1 units = 48 minutes  8 = 6 minutes 15 units = 6 minutes x 15 = 90 minutes Ben took 9 minutes to complete the test.
12. 12. 7Peili PeiliNurul Nurul 7After … 7 Before …
13. 13. 60 + 21 = 81 7 9 units = 81 Peili Nurul 1 unit = 81  9 = 9 7(a) \$9 x 2 - \$7 =\$18 - \$7 = \$11 7(b) \$9 x 5 - \$7 x 2 = \$45 - \$14 = \$31 Before …
14. 14. thinkingproblem solving conceptualunderstanding