August 14, 2012 - Ratios
Class Opening -
Welcome! Please begin by meeting your group members from last class at your whiteboard. You should each have a solution to the Leaky Faucet problem. I want each of you to contribute to the solution. Please do the following:
By the end of class, I should be able to:
Class Syllabus
Create a Table of Contents
Vocabulary - Please write your own meaning for the word “ratio”.
Working with Ratios:
1.This negative, when developed will produce a 4" by 6" photograph.
What is the length of each negative, if the width is 24 millimeters?
Problem Solution:
2. Hugh uses 13 grams of coffee powder to each liter of water. He has a cup which holds 0.3 liters of water. How much coffee powder should he use?
Make a sketch of this problem that shows important information.
Problem Solution:
3. On average, I sleep about 7 hours 45 minutes each day. So, during one year, I sleep for
7.45 x 365 = 2719.25 or about 2700 hours.
This calculation is not correct. What is the correct answer?
Problem Solution:
4.John’s collection contains US, Indian and British stamps. If the ratio of US to Indian stamps is 5 to 2, and the ratio of Indian to British stamps is 5 to 1, what is the ratio of US to British stamps?
Problem Solution:
Class Opening -
Welcome! Please begin by meeting your group members from last class at your whiteboard. You should each have a solution to the Leaky Faucet problem. I want each of you to contribute to the solution. Please do the following:
- Listen to the solution provided by each person in the group. It is important to allow even those of us with the quietest voices time to explain ideas.
- If different solutions are provided, decide as a group how you will write up the solution.
- Be organized as you write up the solution.
- You will present your solution to the other group.
By the end of class, I should be able to:
- write two equivalent ratios
- identify key information in ratios word problems
- solve word problems using ratios
Class Syllabus
Create a Table of Contents
Key Vocabulary
| Vocabulary Words of the Month
|
Vocabulary - Please write your own meaning for the word “ratio”.
Working with Ratios:
1.This negative, when developed will produce a 4" by 6" photograph.
What is the length of each negative, if the width is 24 millimeters?
| What does the question want you to find? | |
| What important information is given? | |
| What ratios can you write for this problem? | |
| Describe how you will solve the problem. |
Problem Solution:
2. Hugh uses 13 grams of coffee powder to each liter of water. He has a cup which holds 0.3 liters of water. How much coffee powder should he use?
Make a sketch of this problem that shows important information.
| What does the question want you to find? | |
| What ratios can you write for this problem? | |
| Describe how you will solve the problem. |
Problem Solution:
3. On average, I sleep about 7 hours 45 minutes each day. So, during one year, I sleep for
7.45 x 365 = 2719.25 or about 2700 hours.
This calculation is not correct. What is the correct answer?
| What does the problem ask you to do? | |
| What important information is given? | |
| What ratios can you write for this problem? | |
| What has been done incorrectly? |
Problem Solution:
4.John’s collection contains US, Indian and British stamps. If the ratio of US to Indian stamps is 5 to 2, and the ratio of Indian to British stamps is 5 to 1, what is the ratio of US to British stamps?
| What does the question want you to find? | |
| What important information is given? | |
| What ratios can you write for this problem? | |
| Describe how you will solve the problem. |
Problem Solution:
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