Question Video: Calculating the Finishing Time of an Event with Times to the Nearest Minute Mathematics • 4th Grade

Natalie has basketball practice at 7:05 pm which lasts for 1 hour and 20 minutes. At what time does she finish?

02:20

Video Transcript

Natalie has basketball practice at 7:05 pm which lasts for one hour and 20 minutes. At what time does she finish?

In this problem, we’re given the start time of Natalie’s basketball practice. It starts at 7:05 pm or five past seven. We’re also given the length of the practice. It lasts for one hour and 20 minutes. And we need to use these two pieces of information to calculate the time that Natalie’s practice finishes.

One way of representing the problem is using a timeline. We could use the start time and the length time to calculate the finish time. Let’s use the numbers we know from the problem.

The start time of Natalie’s practice is 7:05 pm. And it lasts one hour and 20 minutes. And so to find out the time that Natalie’s practice finishes, we need to add one hour and 20 minutes to 7:05 pm.

Instead of making one big jump of one hour and 20 minutes, we can split the time into hours and minutes. One hour and 20 minutes is the same as a jump of one hour and then a smaller jump of 20 minutes.

Let’s add one hour first. What is one hour later than 7:05 pm? The hour digit is the digit seven. And so if we increase this by one hour, the time is 8:05 pm or five past eight.

Now we need to add 20 minutes. What is 20 minutes later than 8:05 pm? Well, the number of minutes at 8:05 pm is five. It’s five past eight. And so if we add 20 to five, we get the time 8:25 pm. And so Natalie finishes at 8:25 pm.

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