## 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?

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?