Understanding Elapsed Time Concepts

The video tutorial introduces the concept of elapsed time, explaining how to calculate it using two methods: a number line and subtraction. It provides examples and practice problems, including estimating elapsed time by rounding. The tutorial also reviews time units and AM/PM concepts.

What is the definition of elapsed time?

• The time it takes to travel a distance

• The total time spent on breaks

• The difference between the start and end time

• The time it takes to complete a task

What does 'AM' stand for in time notation?

• After Midnight

• Ante Meridian

• After Meridian

• Ante Midnight

How many minutes are there in one hour?

• 60 minutes

• 45 minutes

• 90 minutes

• 30 minutes

When using the number line method, what is the first step?

• Estimate the end time

• Add the start and end times

• Subtract the start time from the end time

• Draw a line and mark the start time

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

• Add 60 to the end time minutes

• Add 12 hours to the end time

• Borrow an hour from the end time

• Subtract directly

How do you estimate elapsed time?

• By subtracting the start time from the end time

• By rounding the minutes of start and end times

• By adding 10 minutes to the start time

• By using a stopwatch

If Jeff started studying at 9:17 AM and finished at 10:35 AM, how long did he study?

• 1 hour and 15 minutes

• 1 hour and 18 minutes

• 1 hour and 25 minutes

• 1 hour and 20 minutes

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

• 50 minutes

• 35 minutes

• 40 minutes

• 45 minutes

How many hours does Chris work as a tutor if he starts at 10 AM and ends at 1 PM?

• 2 hours

• 5 hours

• 3 hours

• 4 hours

When calculating elapsed time across AM and PM, what additional step is needed?

• Add 12 hours to the start time

• Subtract 12 hours from the end time

• Add 12 hours to the end time

• Subtract 12 hours from the start time