## Thursday, January 15, 2009

### Math problems of the week: 2nd grade Trailblazers vs. Singapore Math

1. From the last three problems of the final multiplication/division unit in the 2nd volume of the 2nd grade Math Trailblazers workbook, Student Guide Book 2, pp. 340-341.

Each baby bird needs 5 raisins. Mother bird has 16 raisins. Draw the number of baby birds she can feed.

[large space for drawing]

How many baby birds ate raisins? _____

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Each baby bird needs 8 seeds. Mother bird has 16 seeds. Draw the number of baby birds she can feed.

[large space for drawing]

How many baby birds ate seeds? _____

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What did you see on your way home from school today? Use some of these things to write a multiplication or a division problem for the rest of your class to solve. Draw a picture to show what you are multiplying or dividing.

[even larger space for drawing]

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2. From the last three problems of the final multiplication/division unit in the 2nd volume of the 2nd grade Singapore Math workbook, Primary Mathematics 2B, p. 56.

Peter has 9 balls. He wants to put the balls into 2 equal groups.

(a) How many balls are there in each group?

(b) Are there any balls left over?

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Mary has 26 beads and some pieces of string. She puts 6 beads on each string.

How many beads are left over?

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Natalie has a ribbon 37 in. long. She cuts it into pieces 4 in. long each.

How many inches or ribbon are left over?

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3. Extra Credit

1. How many baby birds does the Trailblazers student need to draw?

2. Predict which students will earn higher grades on the Trailblazers homework: artists or math buffs.

3 (a). If you were a mother bird with a large brood, would you only feed some of your babies so that those babies could get the full quantity they "need," or would you spread the food around evenly and fly off to find more?

3 (b). Does a Trailblazers student who answers 16 and 24, respectively, for the first two Trailblazers problems receive full credit if s/he explains her answer and draws nice birds?