1. 8-1 Customary and Metric Measurements Warm Up Problem of the Day
Course 2
Warm Up
Problem of the Day
Lesson Presentation

2. 8-1 Customary and Metric Measurements Warm Up
Course 2
8-1
Customary and Metric Measurements
Warm Up
1. How many days are in 1 week?
2. How many seconds are in 1 minute?
3. How many inches are in 1 foot?
4. How many hours are in 1 day?
5. How many inches are in 1 yard? 7 60 12 24 36

3. 8-1 Customary and Metric Measurements Problem of the Day
Course 2
8-1
Customary and Metric Measurements
Problem of the Day
It takes a driver about 3 4
second to begin
breaking after seeing something on the road.
How many feet does the car travel in that
time if it is going 10 mi/h? 20 mi/h? 30 mi/h?
11 ft; 22 ft; 33 ft

4. Course 2
8-1
Customary and Metric Measurements
Learn to convert measurements between the customary and metric systems.

5. 8-1 Customary and Metric Measurements
Course 2
8-1
Customary and Metric Measurements
Recall that a unit conversion factor is a fraction whose numerator and denominator represent the same quantity but in different units.

6. Additional Example 1: Converting Between Units of Time
Course 2
8-1
Customary and Metric Measurements
Additional Example 1: Converting Between Units of Time
How many hours are there in 102 days?
There are 24 hours in 1 day, so the possible
conversion factors are or Choose
the second factor so that the day units will cancel.
1 day
24 hr
24 hr
1 day
2,448 hr 1
102 days · =
60 s = 1 min
60 min = 1 hr
24 hr = 1 day
365 days = 1 year
Remember!
= 2,448 hr
There are 2,448 hours in 102 days.

7. 8-1 Customary and Metric Measurements Try This: Example 1
Course 2
8-1
Customary and Metric Measurements
Try This: Example 1
How many minutes are there in 12 hours?
There are 60 minutes in 1 hour, so the possible
conversion factors are or Choose
the second factor so that the hour units will cancel.
1 hr
60 min
60 min
1 hr
720 min 1
12 hours · =
= 720 min
There are 720 minutes in 12 hours.

8. 8-1 Customary and Metric Measurements
Course 2
8-1
Customary and Metric Measurements
We use two systems of measurement: customary and metric. The customary system is based on measurements from old English law, and the metric system is based on powers of ten. Each system has its own units.

9. Course 2
8-1
Customary and Metric Measurements

10. Additional Example 2: Making One-Step Unit Conversions
Course 2
8-1
Customary and Metric Measures
Additional Example 2: Making One-Step Unit Conversions
Convert 2,500 centimeters to meters.
There are 100 centimeters to 1 meter.
1 m
100 cm
2,500 m
100
Use a unit conversion
factor.
2,500 cm · =
= 25 m
So 2,500 centimeters is equal to 25 meters.

11. Customary and Metric Measures
Course 2
8-1
Customary and Metric Measures
Try This: Example 2
Convert 15 gallons to quarts.
There are 4 quarts to 1 gallon.
4 qt
1 gal
60 qt 1
Use a unit conversion
factor.
15 gal · =
= 60 qt
So 60 quarts is equal to 15 gallons.

12. Understand the Problem
Course 2
8-1
Customary and Metric Measurements
Additional Example 3: Problem Solving Application
Joshua bought 32 pints of ice cream for the end-of-the-year class party. How many gallons of ice cream did he buy for the party? 1
Understand the Problem
Rewrite the question as a statement:
• Find the number of gallons in 32 pints.
List the important information:
• Joshua bought 32 pints of ice cream. 2
Make a Plan
Use conversion factors to convert pints
to quarts and then quarts to gallons.

13. 8-1 Customary and Metric Measurements Solve 3 1 qt 2 pt 1 gal 4 qt
Course 2
8-1
Customary and Metric Measurements
Solve 3
1 qt
2 pt
1 gal
4 qt
32 gal 8
Use two conversion
factors.
32 pt · =
= 4 gal
Since 32 pints is equal to 4 gallons, Joshua
bought 4 gallons of ice cream for the party. 4
Look Back
A gallon is a greater unit than a pint, so
the answer should be less than 32. So
4 is a reasonable answer.

14. Understand the Problem
Course 2
8-1
Customary and Metric Measurements
Insert Lesson Title Here
Try This: Example 3
John ordered 24 gallons of soda for the
concession stand. If it is dispensed in containers
holding 1 cup, how many individual drinks
will he be able to sell? 1
Understand the Problem
Rewrite the question as a statement:
• Find the number of cups in 24 gallons.
List the important information:
• Joshua has 24 gallons of soda. 2
Make a Plan
Use conversion factors to convert gallons
to quarts and then quarts to pints to cups.

15. 8-1 Customary and Metric Measurements Solve 3 Use three conversion
Course 2
8-1
Customary and Metric Measurements
Solve 3
Use three
conversion
factors.
4 qt
1 gal
2 pt
1 qt
2 c
1 pt =
384 c 1
24 gal
= 384 c
Since 15 gallons is equal to 384 cups, John
had enough soda to sell 384 cups. 4
Look Back
A cup is much smaller than a gallon, so
the answer should be considerably larger
than 24. So 384 is a reasonable answer.

16. Insert Lesson Title Here
Course 2
8-1
Customary and Metric Measurement
Insert Lesson Title Here
Lesson Quiz
1. How many minutes are there in 5.5 hours?
2. How many seconds are in 2 hours?
Convert.
cm = ______ m
4. 64 oz = _______ lb
5. How many gallons of oil are needed to fill a 40-quart barrel?
330 min
7,200 s
3.2 4
10 gal