Calculating Elapsed Time Concepts

The video tutorial explains how to calculate elapsed time and estimate time duration. It provides examples using daily activities like cleaning, washing clothes, studying, and tutoring. The tutorial covers two methods: using a number line and subtraction. It also explains time concepts such as hours, minutes, and seconds, and the difference between AM and PM.

What is the definition of elapsed time?

• The time from the start to the end of an event

• The time it takes to travel a distance

• The time shown on a clock

• The time it takes to complete a task

How many minutes are there in one hour?

• 90 minutes

• 60 minutes

• 45 minutes

• 30 minutes

What is the first step in using the subtraction method to find elapsed time?

• Convert hours to minutes

• Add the start and end times

• Subtract the start time from the end time

• Round off the times

In the subtraction method, what do you do if the minutes in the end time are smaller than the start time?

• Subtract directly

• Add 12 hours to the end time

• Borrow an hour from the end time

• Add 60 minutes to the end time

When rounding off times for estimation, what is the rounded time for 8:25 AM?

• 8:00 AM

• 8:15 AM

• 8:30 AM

• 8:20 AM

What is the estimated elapsed time if the start time is 7:32 AM and the end time is 8:25 AM?

• 1 hour and 5 minutes

• 45 minutes

• 50 minutes

• 1 hour

What is the elapsed time if the start time is 4:28 PM and the end time is 5:09 PM?

• 51 minutes

• 61 minutes

• 41 minutes

• 31 minutes

What is the elapsed time if the start time is 9:17 AM and the end time is 10:35 AM?

• 1 hour and 28 minutes

• 1 hour and 48 minutes

• 1 hour and 38 minutes

• 1 hour and 18 minutes

If the start time is 10 AM and the end time is 1 PM, how many hours have passed?

• 3 hours

• 4 hours

• 5 hours

• 2 hours

How do you calculate elapsed time when the start time is AM and the end time is PM?

• Add 12 hours to the start time

• Add 12 hours to the end time

• Use a number line

• Subtract directly