Estimating and Calculating Elapsed Time

The video tutorial introduces the concept of elapsed time, explaining how to calculate it using examples such as cleaning, washing clothes, studying, and tutoring. It covers both exact and estimated elapsed time calculations, using methods like number lines and subtraction. The tutorial also reviews time units and the AM/PM system.

What is the definition of elapsed time?

• The time it takes to complete a task

• The time it takes to read a book

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

• The time it takes to travel a distance

How do you calculate elapsed time using a number line?

• By counting the number of hours

• By counting the number of minutes between start and end times

• By adding the start and end times

• By subtracting the start time from the end time

What is the first step in the subtraction method for finding elapsed time?

• Add the start and end times

• Subtract the start time from the end time

• Round off the minutes

• Convert hours to minutes

How do you estimate elapsed time?

• By rounding off the minutes and subtracting

• By rounding off the hours

• By adding 10 minutes to the start time

• By using a stopwatch

What is the estimated elapsed time if the actual time is 53 minutes?

• 55 minutes

• 45 minutes

• 50 minutes

• 1 hour

If Jeff studied from 9:17 AM to 10:35 AM, how long did he study?

• 1 hour and 25 minutes

• 1 hour and 20 minutes

• 1 hour and 18 minutes

• 1 hour and 15 minutes

If the start time is 4:28 PM and the end time is 5:09 PM, what is the estimated elapsed time?

• 45 minutes

• 35 minutes

• 30 minutes

• 40 minutes

How do you handle elapsed time calculations across AM and PM?

• By ignoring the AM and PM distinction

• By subtracting 12 hours from the end time

• By adding 12 hours to the start time

• By adding 12 hours to the end time

What is the total elapsed time if Chris works from 10 AM to 1 PM?

• 2 hours

• 3 hours

• 4 hours

• 5 hours

What is the first step in calculating elapsed time using subtraction when the end time is smaller than the start time?

• Subtract directly

• Add 60 minutes to the end time

• Add 12 hours to the start time

• Borrow an hour from the end time