Thursday, June 4, 2009

Math problems of the week: 2nd Grade Investigations vs. Singapore Math

End-of-year addition and subtraction word problems.

1. From tonight's 2nd grade Investigations "How Many Cubes?" worksheet (Unit 6, Session 2.3):
Jake and Sally were playing Roll-a-Square. They had 27 cubes and then rolled a 9. How many cubes do they have now?

Kira and Franco were playing Roll-a-Square. They had just received 53 cubes, but they landed on the space that says "Oh No! Give back 6 cubes." How many cubes do they have now?

Jake and Franco were playing Roll-a-Square. They had 46 cubes and then landed on the space that says "Great! Take 5 more cubes." How many cubes do they have now?

2. From 2nd grade Singapore Math, Primary Mathematics 2B "Review 15", (p. 188):
Jen made 240 cupcakes. She made 405 muffins. How many more muffins than cupcakes did she make?

Wendy made 153 cookies. 89 of them were chocolate cookies. The rest were wheat cookies. How many wheat cookies did she make?

Samantha saved $10.40. She saved $3.95 more than her sister. How much did her sister save?

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3. Extra Credit:

1. Discuss the levels of respect accorded to Singaporean vs. American math learners, considering such things as mathematical tasks, games like Roll a Square, and the number of explanation points per problem set.

2. Do Singaporean school children follow different developmental time tables from their American counterparts?

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