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Multiplying
and Dividing Decimals
Performance Task Objectives
- Multiply a whole number
by a decimal
- Divide decimals by whole
numbers
Sunshine State Standards
Materials
- Student recording sheet
- Paper and pencil
- Calculator
Student arrangement
- Individual or small group
Task
Present the problem on the student Recording Sheet to your students.
Performance Criteria
- Does the student correctly
divide to find the number of gallons needed for the car of his or her
choice?
- Does the student correctly
multiply to find the cost of gasoline for the car?
- Can the student clearly
explain his or her answers?
Directions:
Use the data on the chart below to help you solve this problem.
The distance from St. Louis, Missouri to Atlanta, Georgia is 598.6
miles. The table below shows the average number of miles per gallon for
4 different cars.
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CAR
|
MILES
PER GALLON
|
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Saturn
|
24
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Corvette
|
22
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Mustang
|
28
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Jeep
|
21
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1. Suppose you had to make the trip from St. Louis to Atlanta using one
of the cars from the chart. Assume gasoline in St. Louis costs $1.29 a
gallon.
Select a car. Find the total number of gallons of gasoline needed to drive
the car from St. Louis to Atlanta. Show your work. Use your calculator
to check your answers.
2. What is the cost of driving
the car from St. Louis to Atlanta? Show your work. Use your calculator
to check your answers.
3. Write an explanation of
how you found your answers.
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