3.2+Helping+the+Cook+0910

  1/12/09 TG **__Big Idea__** Many important practical and mathematical applications involve comparing quantities of one kind or another; it is important to know which method to use and how we should use them. Notes: The camp cook must buy enough ingredients for all the meals he intends to prepare for the week. One of the cook's most popular meals is spaghetti. The spaghetti recipe he uses calls for canned tomatoes. The CannedStuff store has large cans of tomatoes on sale, five cans of $4.00. The cook says he can make sauce for five to six campers from each can of tomatoes. In class, we discussed how it's important to carry over your labels. If you don't, it's hard to keep track of the numbers. For example, if you wanted to know how many ounces you get of cereal per dollar in a 20 ounce box, you would divide the number of ounces, 20, by the price, let's say $5.00. 20/5 = 4 ounces per dollar. That's some expensive cereal!

__**3.2 Helping the cook**__ 240 divided by 5 equals 48. I would advise the cook to buy 48 cans of tomato sauce for the 240 campers. 48 multiplied by $4.00 is $192.00. Altogether the cans will cost $192.00.
 * a) ** ** How many cans of tomatoes would you advise the cook to buy to make spaghetti for the 240 campers? Explain your answer. **
 * b) ** ** How much would these cans of tomatoes cost altogether? **

3.2 Follow-up: 
 * 1) ** At the EatMore ** ** grocery store, you can buy seven cans of tomatoes for $ 6.00. The cans are the same size as the cans at CanedStuff. Are the tomatoes at the Eatmore a better buy than the tomatoes at CannedStuff? Explain your answer. **
 * CannedStuff: **
 * 5 cans divided by $4 equals 1.25 cans per dollar **
 * EatMore: **
 * 7 cans divided by $6 equals 1.17 cans per dollar **
 * The tomatoes at EatMore a better buy because you get more cans for each dollar. **
 * 2.** ** Gus was trying to figure out how to think about the EatMore price of seven cans of tomatoes for $6.00. He divided 7 by 6 and got 1.16666667. He then divided 6 by 7 and got 0.85714286. What does each of these numbers mean in the context of seven cans of tomatoes for $6.00? **
 * 6 divided by 7 means how many cans he gets for each dollar. 7 divided by 6 means how many dollars for each can. **