Measuring Elapsed Time on a Number Line

This video tutorial teaches how to measure elapsed time going backwards using a number line. It begins with a review of important vocabulary related to time measurement, such as minutes and hours. The tutorial then explains how to use a number line to count time intervals and solve elapsed time problems. A story problem is presented, demonstrating how to calculate the start time of an activity by subtracting time intervals from the end time. The video concludes with a summary of the lesson.

What does 'elapsed time' refer to?

• The time displayed on a clock

• The amount of time from the beginning to the end of an activity

• The duration of one hour

• A specific moment in time

How many seconds are there in one minute?

• 30 seconds

• 60 seconds

• 120 seconds

• 100 seconds

What does one hour equal to?

• 30 minutes

• 60 seconds

• 100 minutes

• 60 minutes

How is one hour visually represented when measuring elapsed time?

• As a large circle

• As a square block

• As a big pointy mountain

• As a long line

How are ten minutes represented on the number line?

• As a large circle

• As a small rock

• As a big pointy mountain

• As a medium-sized hill

What intervals are used on the number line for measuring elapsed time?

• One hour, ten minutes, and one minute

• One hour, fifteen minutes, and one minute

• One hour, twenty minutes, and one minute

• One hour, five minutes, and one minute

What is the first step in finding elapsed time backwards?

• Subtract the smallest amount of time

• Draw a number line with the start time on the left

• Add the total amount of time

• Record the ending time on the right side of the number line

After subtracting one hour from the ending time, what is the next step?

• Subtract ten minute intervals

• Subtract one minute intervals

• Add one hour back

• Record the new time as the start time

What is the final step in finding the start time after subtracting the given intervals?

• Record the ending time as the start time

• Add the intervals back

• Subtract one minute intervals and record the new time

• Draw another number line

What time did Melissa put the bread in the oven if it was taken out at 6:45 PM and baked for 1 hour and 15 minutes?

• 7:00 PM

• 6:00 PM

• 5:45 PM

• 5:30 PM