Unit 8- Measurement
4th Grade
Day 12
Elapsed Time Notes/Practice
Notes:
Bar and Loop Method
Patrick went to the pool from 10:40 A.M. until 2:45 P.M. How many hours and minutes
was Patrick at the pool?
Step 1: Draw a timeline with the beginning time labeled.
10:40
Start – A.M.
Step 2: Count by hours until you have no hours left to count.
10:40
11:40
1 hour
12:40
2 hours
Start – A.M.
1:40
3 hours
2:40
4 hours
P.M. Begins
Step 3: Count by 5-minute increments using loops on your timeline until you have no minutes left to count.
10:40
1 hour
Start – A.M.
11:40
12:40
2 hours
1:40
3 hours
2:40
2:45
4 hours
+5 min
P.M. Begins
End – P.M.
Step 4: Add the hours and minutes together to get the elapsed time of 4 hours and 5 minutes.
Practice:
(1)
Find the elapsed time from 5:25 P.M.
to 10:40 P.M.
(2)
Find the elapsed time from 11:25 P.M.
to 4:35 A.M.
1
Unit 8- Measurement
4th Grade
Day 12
Elapsed Time Notes/Practice
Notes:
Time Table Method
Patrick went to the pool from 10:40 A.M. until 2:45 P.M. How many hours and minutes
was Patrick at the pool?
Step 1: Use a table like the one below to organize the times. Make sure you label “A.M.” and “P.M.” as necessary.
Start
End
Hours
Minutes
Step 2: Begin with the “Hours” column and add as many hours as you think necessary to get to the “End” time. In
the example, you started with 1 hour and then added that hour to the start time in the “Start” column. An
“X” was placed in the “Minutes” column to show that no minutes had been added.
Start
10:40 A.M.
End
11:40 A.M.
Hours
+1
Minutes
X
Step 3: Continue adding hours until no more hours can be added. Notice that when you cross the “12:00” mark,
the A.M. changes to P.M.
Start
End
Hours
Minutes
10:40 A.M.
11:40 A.M.
+1
X
11:40 A.M.
12:40 P.M.
+1
X
12:40 P.M.
2:40 P.M.
+2
X
2:40 P.M.
2:45 P.M.
Step 4: Since no more hours can be added without going past the end time, minutes must be added. Add as
many minutes as you think need to be until you get to the end time.
Start
End
Hours
Minutes
10:40 A.M.
11:40 A.M.
+1
X
11:40 A.M.
12:40 P.M.
+1
X
12:40 P.M.
2:40 P.M.
+2
X
2:40 P.M.
2:45 P.M.
X
+5
2
Unit 8- Measurement
4th Grade
Day 12
Elapsed Time Notes/Practice
Step 5: Add the amounts in the “Hours” column and then the amounts in the “Minutes” column. This total is the
elapsed time.
Start
End
Minutes
10:40 A.M.
11:40 A.M.
+1
X
11:40 A.M.
12:40 P.M.
+1
X
12:40 P.M.
2:40 P.M.
+2
X
2:40 P.M.
2:45 P.M.
X
4h
Elapsed Time
Solution:
Hours
+5
5 min
Patrick spent 4 hours and 5 minutes at the pool.
Practice:
(1)
A movie starts at 1:35 P.M. and lasts
until 3:50 P.M. How long is the movie?
(2)
A football game began at 3:45 P.M.
and ended at 6:15 P.M. How long did
the game last?
3
Unit 8- Measurement
4th Grade
Day 12
Elapsed Time Notes/Practice
(3)
A bus left Westfield at 6:50 A.M. and
arrived at Summersville at 2:25 P.M.
How long was the trip?
(4)
Mandy started talking on the phone at
5:20 P.M. and finished 55 minutes
later. At what time did she finish talking
on the phone?
(5)
Tamika began reading at 8:30 A.M.
She read for 2 hours and 35 minutes.
What time did Tamika finish reading?
(6)
Sean began his chores at 4:45 P.M.
and finished at 6:15 P.M. How long did
it take Sean to do his chores?
4