Elapsed Time Calculation Using a Number Line

This video tutorial explains how to calculate elapsed time using a number line. It begins with a definition of elapsed time and demonstrates the process with two example problems. The first example calculates the time between 9:55 AM and 10:30 AM, while the second example adds 25 minutes to 8:18 AM. The tutorial emphasizes using increments of five minutes and shows how to adjust for non-even increments.

What does elapsed time represent?

• The amount of time that has passed from the start to the end of an event

• The time when an event ends

• The time when an event starts

• The future time after an event

Tags

CCSS.3.MD.A.1

What is the main purpose of using a number line to calculate elapsed time?

• To avoid using digital tools

• To make the calculation harder

• To visualize the problem

• To use less paper

Tags

CCSS.3.MD.A.1

What is the first step in calculating elapsed time using a number line?

• Drawing arcs for each hour

• Listing the start and end times

• Adding increments of 10

• Calculating the total hours

Tags

CCSS.3.MD.A.1

How many minutes have elapsed between 9:55 AM and 10:30 AM?

• 45 minutes

• 35 minutes

• 30 minutes

• 25 minutes

Tags

CCSS.3.MD.A.1

How is the elapsed time represented on the number line?

• Through the length of the arcs

• By the number of arcs

• Using different colors for each arc

• By the sum of the increments marked by the arcs

Tags

CCSS.3.MD.A.1

In the second example, what is the initial time adjustment made before adding increments of five?

• Subtracting 2 minutes

• No adjustment needed

• Adding 5 minutes

• Adding 2 minutes

Tags

CCSS.3.MD.A.1

Why are increments of five minutes preferred when using a number line for elapsed time?

• It's just a random preference

• Because most times are divisible by five

• To avoid using too many arcs

• Because it's easier to count

Tags

CCSS.3.MD.A.1

What is the final time in the second example after adding 25 minutes to 8:18 AM?

• 8:50 AM

• 8:40 AM

• 8:45 AM

• 8:43 AM

Tags

CCSS.3.MD.A.1

What does adding increments of time on a number line help to determine?

• The start time of an event

• The end time of an event

• The total elapsed time

• The number of days passed

Tags

CCSS.3.MD.A.1

What is the significance of the size of the arcs in the number line method?

• It determines the amount of elapsed time

• It has no significance

• Larger arcs represent longer times

• It indicates the start time