## Wednesday, April 16, 2008

### Math problem of the week: Investigations vs. Singapore Math

1. Grade 1 Investigations, Number Games and Story Problems, Investigation 2, Session 3, Student Sheet 12.

Collect 25¢

Note to families: Your child may play this game with only pennies.  Other coins are optional. If you don't have a dot cube (or die), use Number Cards or write the numbers 1-6 on slips of paper, turn them facedown, and draw them from a pool.

Materials: One dot cub
Coins (about 30 pennies, 6 nickels, 4 dimes, and 1 quarter)

Players: 2
Object: With a partner, collect 25¢ in coins.
How to Play
1. To start, one player rolls the dot cube. What amount did you roll?  Take that amount in coins.
2. Take turns rolling the dot cube.  Take that amount in coins and add them to the collection. You may use all pennies, or you may trade coins at any time (for example, 1 nickel for 5 pennies).
3. After each turn, check your total amount.  The game ends when you have 25¢

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2. Grade 1 Singapore MathFrom a similar point in the curriculum, Primary Mathematics 1B Workbook, p. 151

Subtract.

40 - 30 = 60 - 20 =
49 - 30 = 62 - 20 =
30 - 10 = 80 - 40 =
36 - 10 = 83 - 40 =
50 - 40 = 90 - 80 =
57 - 40 = 95 - 80 =

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OILF exercise for parents:  Enumerate the math skills that each assignment involves.

Extra Credit: For each assignment, from start (reading the directions) to finish (putting everything away), estimate the ratio of learning to time expenditure.