## Friday, February 18, 2011

### Math problems of the week: 4th grade Trailblazers vs. Singapore Math

I. Final five word problems in the 4th grade Math Trailblazers Discovery Assignment Book (p. 215):

John's older brother is in college. His brother and his three roommates want to buy a new stereo that costs \$764. If they split the cost of the stereo evenly, how much should each student pitch in?

Ming built a house of cards. Before the house came tumbling down, he used 2 full decks of cards. The house also contained all but 15 cards from a third deck. About how many cards were in Ming's house of cards? (A deck of cards has 52 cards).

On vacation, Shannon's family took 3 rolls of 24 pictures and 2 rolls of 36 pictures. How much pictures did the family take in all?

Roberto is driving with his family to visit his grandmother. After driving 144 miles from Chicago, the family stops for lunch. They drive 89 more miles and stop for gas. Then, they stop for a soft drink after driving 123 more miles. Roberto's grandma lives 375 miles form Chicago. About how many more miles must they drive before they reach their grandmother's house?

If one year is 365, how many days old will you be when you are 16 years old?

II. Final five word problems in the 4th grade Singapore Math Primary Mathematics 4B Workbook, (p. 215):

A tank can hold 30.1 gal of water. A bucket can hold 1/7 as much water as the tank. Find the capacity of the bucket.

The perimeter of a rectangle is 30 in. The width of the rectangle is half its length. Find the area of the rectangle.

Neil saved 15 quarters in January. He saved 35 nickels in February. He saved 21 dimes in March. How much money did he save in the three months?

How many quarters are there in \$116.75?

Show all the possible outcomes for the gender (boy or girl) of three children in a family.

III.  Extra Credit

Estimate the ratio of verbiage to mathematical challenge in the Trailblazers vs. the Singapore Math problem sets.