6th Grade Math Textbook, Progress

Compute with Time

13-6

Find the elapsed time.

1. from 3:15 P.M. to 6:30 P.M. 2. from 5:55 A.M. to 7:30 A.M.


2. from 10:30 A.M. to 3:15 P.M. 4. from 9:20 A.M. to 1:30 P.M.


3. from 5:16 A.M. to 9:35 A.M. 6. from 6:22 A.M. to 2:10 P.M.

60 seconds (s)
1 minute (min)

60 min
1 hour (h)

24 h
1 day (d)

7 days
1 week (wk)

12 months (mo)
1 year (y)

365 d
1 y

100 y
1 century (cent.)

Tim’s watch reads 8:55 A.M. If he plans

to go to lunch at 12:00 P.M., how much

longer must he wait?

To find how much time longer, find the

elapsed time from 8:55 A.M.to 12:00 P.M.

You may use mental math or subtract

using paper and pencil.

Mental Math Paper and Pencil

5 10

From 8:55 A.M. to 9:00 A.M. is 5 min. 12:00 1 1 : 6 0

From 9:00 A.M. to 12:00 P.M. is 3 h.  0 8:55  0 8:5 5

The elapsed time is 3 h 5 min. 08:55  0 3:0 5

Tim must wait 3 h 5 min.

You can add to find the ending time of an event.

Pam boards the bus from her home at 12:15 P.M.If it takes 1 h 55 min to

reach her destination, at what time will Pam reach her destination?

To find the time, t, add: 12 h 15 min 1 h 55 min 
t.

12 h 15 min

 1 h 55 min

13 h 70 min
14 h 10 min 2:10 P.M.

Pam reaches her destination at 2:10 P.M.

Study these examples.

2 80

3 min 20 s

2 min 35 s

0 min 45 s
45 s

8 wk 2 d

 4

32 wk 8 d
33 wk 1 d

3 y 8 mo  2

44 mo  2 
22 mo

22 mo 
1 y 10 mo

Regroup

1 h as 60 min.

3:05 
3 h 5 min

2.0

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