9-5 Time and Temperature

Course 1

Warm UpWarm Up

Lesson PresentationLesson Presentation

Problem of the DayProblem of the Day

Warm UpConvert each measurement to feet and inches.

1. 95 in. 2. 128 in.

Convert each measurement to meters.

3. 406 cm 4. 24,671 mm

7 ft 11 in.

Course 1

9-5 Time and Temperature

10 ft 8 in.

4.06 m 24.671 m

Problem of the Day

The skateboard had rolled from the house to within 1.8 m of the street before Rick caught it. If the house is 16.9 m from the street, how far did the skateboard roll?

15.1 m

Course 1

9-5 Time and Temperature

Learn to find measurements of time and temperature.

Course 1

9-5 Time and Temperature

Time

1 year (yr) = 365 days1 year = 12 months (mo)1 year = 52 weeks1 week = 7 days

1 day = 24 hours (hr)1 hour = 60 minutes (min)1 minute = 60 seconds (s)

Course 1

9-5 Time and Temperature

2 hours 5 minutes

125 minutes

Think: 1 hour = 60 minutes.

Course 1

9-5 Time and Temperature

Additional Example 1A: Converting Time

Convert.

2 hr 5 min = _____ min

(2 60) minutes plus 5 minutes

2 hr 5 min = 125 min

Think: 1 hour = 60 minutes.

Course 1

9-5 Time and Temperature

Additional Example 1B: Converting Time

Convert.

195 min = _____ hr

195 60

195 min • 1 hr 60 min

=

195 min = 3 hr1 4

Write as a mixed number.

hr

Think: 1 hour = 60 minutes and 1 minute = 60 seconds.

Course 1

9-5 Time and Temperature

Additional Example 1C: Converting Time

Convert.

3 hr = _____ s

60 s 1 min

3 hr • 60 min 1 hr

•

3 hours = 10,800 seconds

= 10,800 s

3 days 7 hours

79 hours

Think: 1 day = 24 hours.

Course 1

9-5 Time and Temperature

Check It Out: Example 1A

Convert.

3 days 7 hr = _____ hr

(3 24) hours plus 7 hours

3 days 7 hr = 79 hr

Think: 1 year = 12 months.

Course 1

9-5 Time and Temperature

Check It Out: Example 1B

Convert.

102 mo = _____ yr

102 12

102 mo • 1 yr 12 mo

=

102 mo = 8 yr1 2

Write as a mixed number.

yr

Think: 1 day = 24 hours and 1 hour = 60 minutes.

Course 1

9-5 Time and Temperature

Check It Out: Example 1C

Convert.

2 days = _____ min

60 min 1 hr

2 days • 24 hr 1 day

•

2 days = 2,880 min

= 2,880 min

Course 1

9-5 Time and Temperature

The time between the start of an activity and the end of an activity is called the elapsed time.

Arrival time: 12:10 P.M.

Think: 1 hour after 10:15 A.M. is 11:15 A.M. 55 minutes after that is 12:10 P.M.

Course 1

9-5 Time and Temperature

Additional Example 2A: Finding Elapsed Time

Shawn was scheduled to arrive at 10:15 A.M. he was 1 hour and 55 minutes late. When did he arrive?

Scheduled time: 10:15 A.M.

Shawn arrived at 12:10 P.M.

Begin time: 10:50 A.M.

Think: 2 hours before 1:35 P.M. is 11:35 A.M. 45 minutes before that is 10:50 A.M.

Course 1

9-5 Time and Temperature

Additional Example 2B: Finding Elapsed Time

Ty met his friends at 1:35 P.M. He had traveled for 2 hours and 45 minutes. At what time did Ty begin his trip?

End time: 1:35 P.M.

Ty began his trip at 10:50 A.M.

Arrival time: 11:00 A.M.

Think: 1 hour after 9:45 A.M. is 10:45 A.M. 15 minutes after that is 11:00 A.M.

Course 1

9-5 Time and Temperature

Check It Out: Example 2A

Trent’s ferry was scheduled to arrive at 9:45 A.M. he was 1 hour and 15 minutes late. When did he arrive?

Scheduled time: 9:45 A.M.

Trent’s ferry arrived at 11:00 A.M.

Departure time: 1:40 P.M.

Think: 3 hours before 4:55 P.M. is 1:55 P.M. 15 minutes before that is 1:40 P.M.

Course 1

9-5 Time and Temperature

Check It Out: Example 2B

Franco’s train arrived at 4:55 P.M. He had traveled for 3 hours and 15 minutes. At what time did Franco’s train depart?

Arrival time: 4:55 P.M.

Franco’s train departed at 1:40 P.M.

Temperature Conversions

To convert Celsius to Fahrenheit

use F = C + 32.

To convert Fahrenheit to Celsius

use C = (F – 32).

Course 1

9-5 Time and Temperature

9 5

5 9

Celsius and Fahrenheit are the scales used to measure temperature. You can use these formulas to convert temperature.

Round to 2, and 32 to 30

Use the formula.

Course 1

9-5 Time and Temperature

Additional Example 3A: Estimating Temperature

Estimate the temperature.

40°C is about _____ °F.

F = • C + 32

F = 2 • 40 + 30

9 5

Use the order of operations.

9 5

F = 80 + 30

F = 110

40°C is about 110°F.

Round to , and 32 to 30

Use the formula.

Course 1

9-5 Time and Temperature

Additional Example 3B: Estimating Temperature

Estimate the temperature.

70°F is about _____ °C.

C = (F – 32)

C = (70 - 30)

5 9

Use the order of operations.

5 9

C = (40)

C = 20

70°F is about 20°C.

1 2

1 2

1 2

Round to 2, and 32 to 30

Use the formula.

Course 1

9-5 Time and Temperature

Check It Out: Example 3

Estimate the temperature.

12°C is about _____ °F.

F = • C + 32

F = 2 • 12 + 30

9 5

Use the order of operations.

9 5

F = 24 + 30

F = 54

12°C is about 54°F.

Round to , and 32 to 30

Use the formula.

Course 1

9-5 Time and Temperature

Check It Out: Example 3B

Estimate the temperature.

82°F is about _____ °C.

C = (F – 32)

C = (82 – 30)

5 9

Use the order of operations.

5 9

C = (52)

C = 26

82°F is about 26°C.

1 2

1 2

1 2

Lesson Quiz

Convert.

1. 17 min = _____ s 2. 49 days = _____ weeks

3. 336 hr = _____ weeks

4. Ray drove 3 hours and 10 minutes to visit

friends. He started his trip at 9:45 A.M. What was his

arrival time?

Estimate the temperature.

5. 20°C is about ____ °F 6. 66°F is about ____ °C

71,020

Insert Lesson Title Here

2

12:55 A.M.

Course 1

9-5 Time and Temperature

70 18