# Elapsed Time

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Team Digital
Elapsed Time
CCSS.MATH.CONTENT.4.MD.A.2

## Basics on the topicElapsed Time

Zuri and Freddie are participating in a scavenger hunt to win tickets to the big movie premiere! Not only do they have to find the clues, but they also have to calculate how long it took, or the elapsed time, to find each one. They need your help calculating elapsed time using a T chart!

### TranscriptElapsed Time

1 comment
1 comment
1. i like this!

From Nadiya, over 1 year ago

## Elapsed Time exercise

Would you like to apply the knowledge you’ve learned? You can review and practice it with the tasks for the video Elapsed Time .
• ### How long was the movie?

Hints

To figure out the length of the movie, add up the elapsed time on the right side of the chart.

How many hours and minutes are there altogether?

Solution

The movie was 1 hour and 45 minutes long.

If we add 10 + 30 + 5 we get 45.

1 hour plus 45 minutes is 1 hour 45 minutes.

• ### How long did it take Freddie and Zuri to get home?

Hints

Calculate how many hours or minutes have passed between each set of times on the left side of the chart.

Put the total elapsed time at the bottom by adding the time intervals on the right side of the chart.

Solution

The elapsed time of the bus journey was 1 hour and 15 minutes.

• 8:25 - 9:25 is 1 hour
• 9:25 - 9:30 is 5 minutes
• 9:30 - 9:40 is 10 minutes
• 5 minutes + 10 minutes = 15 minutes
• 1 hour + 15 minutes = 1 hour 15 minutes
• ### Which movie do Freddie and Zuri have time to watch?

Hints

Are any of the movies over 2 hours? Remember, Freddie and Zuri only have 1 hour and 50 minutes.

You could draw your own chart like this, and add small intervals of time to figure out which film they have time to watch.

Solution

Freddie and Zuri have time to watch Breezy Beachball!

It starts at 1:55 and ends at 3:45, so the elapsed time is 1 hour 50 minutes.

• If we add 1 hour to 1:55 we get to 2:55.
• We could then add on 5 minutes to get to 3:00.
• Next, we could add on 45 minutes to get to 3:45.
• If we add 45 + 5 we get 50.
• 1 hour + 50 minutes = 1 hour 50 minutes.
• ### How long did each activity take?

Hints

Start by adding hours if you can, like in this example.

Solution

Freddie and Zuri spent:

• 1 hour 45 minutes cleaning.
• 55 minutes shopping.
• 50 minutes gardening.
• 1 hour 20 minutes cooking.
_____________________________________________________

Cleaning

• Starting at 9:20 we add on 1 hour to get to 10:20.
• We can then add on 10 minutes to get to 10:30.
• Then add on 30 minutes to get to 11:00.
• Finally, 5 minutes to get to 11:05.
• Add 10 + 30 + 5 to get 45 minutes.
• 1 hour + 45 minutes = 1 hour 45 minutes.
Shopping
• First, add 5 minutes to get to 11:30.
• Then add on 30 minutes to get to 12:00.
• Finally, add on 20 minutes to get to 12:20.
• 5 + 30 + 20 = 55 minutes.
Gardening
• First, add on 25 minutes to get to 5:00.
• Then add on another 25 minutes to get to 5:25.
• 25 + 25 = 50 minutes.
Cooking
• Start by adding 1 hour to get to 7:05.
• We could then add on 20 minutes to get to 7:25.
• 1 hour + 20 minutes = 1 hour 20 minutes.
• ### How long was the TV show?

Hints

Add the intervals of time on the right side of the chart to find the total elapsed time.

Is the the TV show more than or less than one hour?

Solution

The TV show was 35 minutes long.

If we add 20 and 15 we get 35, so the elapsed time of the show was 35 minutes.

• ### Are the elapsed times correct?

Hints

Solution

Here are the errors that should have been highlighted.

9:17 - 10:43

• Here the minutes were incorrect. This should have been 1 hour and 26 minutes.
• If we add 1 hour to 9:17 we get to 10:17.
• We can then add 3 minutes to get to 10:20.
• Then 10 minutes to get to 10:30.
• Then 10 minutes to get to 10:40.
• And 3 minutes to get to 10:43.
• 3 + 10 + 10 + 3 = 26. 1 hour + 26 minutes = 1 hour and 26 minutes.
9:26 - 10:52
• This one is correct.
• If we add 1 hour to 9:26 we get to 10:26.
• We can then add 4 minutes to get to 10:30.
• Then 20 minutes to get to 10:50.
• And 2 minutes to get to 10:52.
• 4 + 20 + 2 = 26. 1 hour + 26 minutes = 1 hour and 26 minutes.
9:51 - 11:04
• Here the hours were incorrect. This should have been 1 hour and 13 minutes.
• If we add 1 hour to 9:51 we get to 10:51.
• We can then add 9 minutes to get to 11:00.
• And 4 minutes to get to 11:04.
• 9 + 4 = 13. 1 hour + 13 minutes = 1 hour and 13 minutes.
10:13 - 11:27
• Here the hour and minutes were both incorrect. This should have been 1 hour and 14 minutes.
• If we add 1 hour to 10:13 we get to 11:13.
• We can then add 2 minutes to get to 11:15.
• Then 10 minutes to get to 11:25.
• And 2 minutes to get to 11:27.
• 2 + 10 + 2 = 14. 1 hour + 14 minutes = 1 hour and 14 minutes.