Elapsed Time Concepts and Calculations

This video tutorial teaches how to calculate elapsed time using an open number line. It covers three scenarios: calculating elapsed time with hours only, with hours and minutes, and when either the start or end time is unknown. The tutorial provides step-by-step instructions and examples for each scenario, emphasizing the importance of distinguishing between hours and minutes.

What does elapsed time refer to?

• The time remaining until an event

• The time shown on a clock

• The time that has passed between two events

• The time it takes to complete a task

Which of the following is NOT an example of elapsed time?

• Duration of a meeting

• Time left before a movie starts

• Time between breakfast and lunch

• Time taken to travel from home to school

How do you represent the start and end times on an open number line?

• With horizontal lines

• With dotted lines

• With vertical lines

• With diagonal lines

If you are given the times 10:00 a.m. and 1:00 p.m., how many hours have elapsed?

• 3 hours

• 2 hours

• 4 hours

• 5 hours

When calculating elapsed time with hours only, what should you avoid counting?

• The spaces between the hours

• The starting hour

• The vertical lines

• The total number of hours

How do you label each space on the number line when calculating hours?

• With hours

• With days

• With minutes

• With seconds

How do you find the elapsed time when only hours are given?

• Count the vertical lines

• Subtract the start time from the end time

• Count the spaces between hours

• Add the start and end times

What is the purpose of labeling each space on the number line?

• To keep track of time

• To add more information

• To make it look neat

• To confuse the students

If a babysitter works from 4:00 p.m. to 8:20 p.m., how long did she work?

• 5 hours

• 4 hours and 30 minutes

• 4 hours and 20 minutes

• 4 hours

Why can't you simply add hours and minutes together when calculating elapsed time?

• Because hours are longer than minutes

• Because they are the same unit

• Because minutes are longer than hours

• Because they are different units