elapsed time
Post on 12-May-2015
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ELAPSED TIMETHE “2 T-CHARTS” METHOD
SAMPLE PROBLEM
JOSEPH LEFT HOME AT THE TIME SHOWN ON THE CLOCK BELOW. HE RETURNED HOME AT 4:08 P.M. HOW LONG WAS HE
AWAY FROM HOME?
9:57 A.M.
SETTING UP THE PROBLEM
AFTER READING THE PROBLEM, IDENTIFY THE INFORMATION YOU ARE GIVEN IN THE PROBLEM.
START TIME: 9:57 A.M.
END TIME: 4:08 P.M.
ELAPSED TIME: ???
CREATE 2 T-CHARTS
START TIME: 9:57 A.M.END TIME: 4:08 P.M.ELAPSED TIME: ???
*DRAW 2 T-CHARTS: ONE TO REPRESENT HOURS, THE OTHER TO REPRESENT MINUTES.
HOURS MINUTES
HOURS MINUTES
FILL IN THE T-CHARTS
9:57START TIME
10:57
11:57
12:57
1:57
2:57
3:57
1
1. ADD 1 HOUR AT A TIME. GET ASCLOSE TO THE END TIME AS POSSIBLE
WITHOUT GOING OVER!
1
1
1
1
1
START TIME: 9:57 A.M.END TIME: 4:08 P.M.ELAPSED TIME: ???
HOURS MINUTES
FILL IN THE T-CHARTS
9:57
10:57
11:57
12:57
1:57
2:57
3:57
1
1
1
1
1
1
3:57
2. NOW ADD THE MINUTES. ADD 10 MINUTES AT A TIME TO SPEED UP THE PROCESS. THEN, ADD THE NUMBER
NEEDED TO ARRIVE AT THE END TIME.
4:07 10
4:08 1
START TIME: 9:57 A.M.END TIME: 4:08 P.M.ELAPSED TIME: ???
HOURS MINUTES
ADD UP THE HOURS AND MINUTES
9:57
10:57
11:57
12:57
1:57
2:57
3:57
1
1
1
1
1
1
3:57
3. ADD UP THE HOURS AND MINUTES FROM THE RIGHT SIDE OF THE T-CHART
TO CALCULATE ELAPSED TIME.
4:07 10
4:08 1
6 HOURS
11 MINUTES
ELAPSED TIME= 6 HOURS AND 11 MIN.
START TIME: 9:57 A.M.END TIME: 4:08 P.M.ELAPSED TIME: ???
SAMPLE PROBLEM #2
EMMA WENT TO A MOVIE THAT STARTED AT 1:17 P.M. IT WAS 2 HOURS AND 56 MINUTES LONG. WHEN DID
THE MOVIE END?
SET UP THE T-CHARTS
START TIME: 1:17 P.M.END TIME: ??ELAPSED TIME: 2 HOURS AND 56 MINUTES
HOURS MINUTES
START TIME 1:17
ADD THE HOURS
HOURS MINUTES
START TIME 1:17
1
1
1. ADD TWO HOURS
2:17
3:17
START TIME: 1:17 P.M.END TIME: ??ELAPSED TIME: 2 HOURS AND 56 MINUTES
ADD THE MINUTES
HOURS MINUTES1:17
1
1
2:17
3:17
3:17
2. NOW ADD THE MINUTES.
10101010106
3:273:373:473:574:074:13
START TIME: 1:17 P.M.END TIME: ??ELAPSED TIME: 2 HOURS AND 56 MINUTES
THE END TIME
HOURS MINUTES1:17
1
1
2:17
3:17
3:17
THE END TIME = 4:13 P.M.
10101010106
3:273:373:473:574:074:13
START TIME: 1:17 P.M.END TIME: ??ELAPSED TIME: 2 HOURS AND 56 MINUTES
SAMPLE PROBLEM #3
JACK TOOK A RODE TRIP TO FLAGSTAFF. HE LEFT HIS HOUSE AT
10:32 A.M. HE ARRIVED IN FLAGSTAFF AT 3:06 P.M. HOW LONG WAS HIS TRIP?
SET UP THE T-CHARTS
START TIME: 10:32 A.M.END TIME: 3:06 P.M.ELAPSED TIME: ???
HOURS MINUTES
START TIME 10:32
ADD THE HOURS
START TIME: 10:32 A.M.END TIME: 3:06 P.M.ELAPSED TIME: ???
HOURS MINUTES10:32
11:3212:321:322:32
1111
ADD THE MINUTES
START TIME: 10:32 A.M.END TIME: 3:06 P.M.ELAPSED TIME: ???
HOURS MINUTES10:32
11:3212:321:322:32
1111
2:32
2:422:523:023:06
1010104
FIND THE TOTAL HRS. AND MINS.
START TIME: 10:32 A.M.END TIME: 3:06 P.M.ELAPSED TIME: ???
HOURS MINUTES10:32
11:3212:321:322:32
1111
2:32
2:422:523:023:06
1010104
4 34
ELAPSED TIME= 4 HOURS AND 34 MIN.
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