Cooking Up Fractions

### Topic: A Mathematics Project for Middle School Students.

### Purpose: In this lesson students will

Reinforce their multiplying and dividing fractions skills by increasing and decreasing the serving size in a recipe.

Practice using search engines. Searching for recipes on their own to increase and decrease the recipe size.(Make sure fractions are in the recipes they choose.) .

### Materials: Computers with Internet access.

### Procedure:

**Look at the recipe for Jam Thumbprints **

**
****
****Re-write the entire recipe so it makes
three times as many cookies.**
**Let's now re-write the directions to the recipe changing the numbers so the recipe makes sense.**
**You just found out there are not as many people coming over for dinner as you thought. Let's not waste food! Re-write the entire recipe so it serves 12. **

**
**
**Let's Search for a recipe from KRAFTFOODS **

**
**
- You are to search for a recipe called Blueberry Bubbleloaf in the Kraftfoods search engine.
- Hint: When searching for this recipe, try Blueberry for a keyword.
**Re-write the fractions to the Blueberry Bubbleloaf so it**** serves 4.****
**- Now re-write the directions to the recipe changing the numbers so the recipe makes sense.

**
****Your next great recipe to search in Kraftfoods will beTomato and Basil Pasta **

- Hint: For your keyword try Tomato. Watch out for several recipes in this category.
- You are having guests over for dinner. Re-write the recipe so it serves
**4**.
- Uh..Oh...You just recieved a phone call!
**More guests are coming over!** Let's make sure you have enough food.

- Re-write the Fresh Tomato and Basil Pasta so it
** serves 24**.

**For a real challenge - Use the search engine below to find your own recipe.**

**Find a recipe on the web that contains at least 3 fractions. **
**Re-write the recipe for half as many people. **
**Re-write the recipe for three times as many people as the original recipe. **
**Include the URL of the recipe you find.**

Return to Molly Silha's home page.

Send comments to:
silha@girltech.cs.rice.edu

**
This page was developed through
GirlTECH '97,
a teacher training and student technology council program sponsored by the
Center for Research on Parallel
Computation (CRPC),
a National Science Foundation-funded
Science and Technology
Center.**

**Thanks to the RGK
Foundation for its generous support.**
© June 1997 Molly Silha
http://teachertech.rice.edu/Participants/silha/

A special thanks to K. Herrmann for her version of Jam Thumbprints.