Learning Target:Students will learn how to add or

subtract measures of time and solve real life problems by computing and

understanding elapsed time.

Relationships between units of time:

1 hour (h) = 60 minutes (min)

1 minute (min) = 60 seconds (sec)

Add or subtract the measures of time.3 min 26 sec

+ 1 min 40 sec a

4 min 16 sec- 2 min 18 sec s

Add or subtract the measures of time.3 min 26 sec

+ 1 min 40 sec a5 min 6 sec

4 min 16 sec- 2 min 18 sec s

1 min 58 sec

Add or subtract the measures of time.5 h 29 min 8 sec

+ 2 h 45 min 33sec d

6 h 32 min 27 sec- 4 h 1 min 45 sec s

Add or subtract the measures of time.5 h 29 min 8 sec

+ 2 h 45 min 33sec d8 h 14 min 41 sec

6 h 32 min 27 sec- 4 h 1 min 45 sec s

2 h 30 min 42 sec

The amount of time between a start time and an end time is called

elapsed time.

Why is it important to understand elapsed time?

Find the elapsed time.

A. 6:00 A.M. to 11:00 A.M.B. 7:30 A.M to 11:45 A.M.C. 11:45 A.M. to 2:15 P.MD. 8:50 P.M to 3:30 A.M.

Find the elapsed time.

A. 6:00 A.M. to 11:00 A.M.5 hours

B. 7:30 A.M to 11:45 A.M.4 hours 15 min

C. 11:45 A.M. to 2:15 P.M2 hours 30 min

D. 8:50 P.M to 3:30 A.M.6 hours 40 min

Your bus leaves Glenwood Station at 9:23 A.M. and arrives at Part Station at 10:08 A.M. How long is the bus ride?

Your bus leaves Glenwood Station at 9:23 A.M. and arrives at Part Station at 10:08 A.M. How long is the bus ride?

45 min

A seed planted at 6:30 A.M. sprouts at 7:14 P.M.

Find the elapsed time.

A seed planted at 6:30 A.M. sprouts at 7:14 P.M.

Find the elapsed time.12 hours 44 min.

Can you add or subtract measures of time and solve real life problems by

computing and understanding elapsed time?