splash screen. lesson menu main idea example 1:use the four-step plan key concept: problem-solving...
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Main Idea
Example 1: Use the Four-Step Plan
Key Concept: Problem-Solving Strategies
Example 2: Use a Strategy in the Four-Step Plan
• Solve problems using the four-step plan.
• Understand
• Plan
• Solve
• Check
Use the Four-Step Plan
SPENDING A can of soda holds 12 fluid ounces. A 2-liter bottle holds about 67 fluid ounces. If a pack of six cans costs the same as a 2-liter bottle, which is the better buy?Understand What are you trying to find?
You are trying to find the number of fluid ounces of soda in a pack of six cans. This number can then be compared to the number of fluid ounces in a 2-liter bottle to determine which is the better buy.
What information do you need to solve the problem?You need to know the number of fluid ounces in each can of soda.
Use the Four-Step Plan
Plan You can find the number of fluid ounces of soda in a pack of six cans by multiplying the number of fluid ounces in one can by six.
Solve 12 × 6 = 72
There are 72 fluid ounces of soda in a pack of six cans. The number of fluid ounces of soda in a 2-liter bottle is about 67. Therefore, the pack of six cans is the better buy because you get more soda for the same price.
(Answer): The pack of six cans is the better buy.
Use the Four-Step Plan
Check Is your answer reasonable?
The answer makes sense based on the facts given in the problem.
1. A
2. B
3. C
4. D
0% 0%0%0%
A. 3 buses
B. 4 buses
C. 5 buses
D. 6 buses
FIELD TRIP The sixth grade class at Meadow Middle School is taking a field trip to the local zoo. There will be 142 students plus 12 adults going on the trip. If each school bus can hold 48 people, how many buses will be needed for the field trip?
Use a Strategy in the Four-Step Plan
POPULATION For every 100,000 people in the United States, there are 5,750 radios. For every 100,000 people in Canada, there are 323 radios. Suppose Sheamus lives in Des Moines, Iowa and Alex lives in Windsor, Ontario. Both cities have about 200,000 residents. About how many more radios are there in Sheamus’s city than in Alex’s city?
Understand You know the approximate number of radios per 100,000 people in both Sheamus’s city and Alex’s city.
Use a Strategy in the Four-Step Plan
Plan You can find the approximate number of radios in each city by multiplying the estimate per 100,000 people by two to get an estimate per 200,000 people. Then, subtract to find how many more radios there are in Des Moines than in Windsor.
Solve Des Moines: 5,750 2 = 11,500
Windsor: 323 2 = 646
11,500 – 646 = 10,854
(Answer): So, Des Moines has about 10,854 more radios than Windsor has.
Use a Strategy in the Four-Step Plan
Check Based on the information given in the problem, the answer seems to be reasonable.
1. A
2. B
3. C
4. D0% 0%0%0%
A. No, he will have only read 483 pages.
B. No, he will have only read 492 pages.
C. yes
D. not enough information given
READING Ben borrows a 500-page book from the library. On the first day, he reads 24 pages. On the second day, he reads 39 pages and on the third day he reads 54 pages. If Ben follows the same pattern of number of pages read for seven days, will he have finished the book at the end of the week?
