Let's solve some real-world problems involving time together.
This morning, Andrew wanted to leave his house at 8:15 a.m., but he left 27 minutes late. What time did Andrew actually leave his house?
Let’s create a timeline for the problem.
We know the starting time and the elapsed time.
We add them.
8:15 a.m. + 27 minutes = ?
We only need to add the minutes:
15 + 27 = 42
Then, add the hour back.
Andrew left his house at 8:42 a.m.
Great job. Not so bad right?
The delivery van left the storage unit at 6:40 a.m. It arrived at its destination at 11:20 a.m. How long did it take for the delivery van to reach its destination?
The problem is asking us to find the elapsed time.
Elapsed time is the time between a start and end event.
We find the elapsed time by subtracting the starting time from the ending time.
11:20 a.m. - 6:40 a.m. = ?
Let’s solve this using the timeline.
Now, we add the hours and the minutes.
The sum is 4 hours and 40 minutes.
It took the delivery van 4 hours and 40 minutes to reach its destination.
Tip: You can also use the zoom trick you learned earlier to find the answer.
Fantastic.
Now, build your skills with some practice.