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Elapsed time is the difference between a beginning time and an ending time.
Elapsed time is the difference between a beginning time and an ending time.
There are three main types of elapsed time problems.
There are three main types of elapsed time problems.
- The beginning and ending times are given and the time that passes must be calculated. For example: A game starts at 2:10 pm and ends at 4:45 pm. How long did the game last?
- The beginning time is given, the length of the event is given, and the ending time must be calculated. For example: A game starts at 2:10 and lasts for 2 hours and 35 minutes. What time does the game end?
- The ending time and the elapsed time are given and the beginning time must be calculated. For example: A game lasted 2 hours and 35 minutes and ended at 4:45 pm. At what time did the game begin?
Calculating elapsed time can be tricky. Our number system is based on tens, and we typically calculate and regroup using a system of tens. Time, on the other hand, involves 60 minutes in 1 hour, and hours are counted up to 12 before starting over from 1. Our normal system of adding and subtracting using groups of tens will not work.
One good method of calculating elapsed time involves using a variation of a number line as a tool. The time line makes for good visual in order to "see" time passing.
One good method of calculating elapsed time involves using a variation of a number line as a tool. The time line makes for good visual in order to "see" time passing.
A game starts at 2:10 pm and ends at 4:45 pm. How long did the game last?
Another way to figure elapsed time is by using a "Z".
Another way to figure elapsed time is by using a "Z".
- The first section of the Z shows how many minutes pass until a whole hour.
- The second section shows the passage of whole hours.
- The bottom of the Z shows the minutes between the last whole hour and the target time.
T- chart
T- chart
A chart can be used to count up the hours and minutes.
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