Exploring Elapsed Time with the Z Method

Mrs. Parr introduces the concept of elapsed time and demonstrates the Z method, a strategy for calculating elapsed time when the start and end times are known. Through multiple examples, she explains how to use the Z method to break down time into manageable segments, calculate elapsed time, and handle complex time scenarios. The video concludes with a summary of the method's effectiveness and a brief mention of alternative strategies for different scenarios.

What is the primary purpose of the Z method?

• To calculate the start time given the end time

• To find the elapsed time between a start and end time

• To draw a Z on a clock

• To convert minutes into hours

Tags

CCSS.3.MD.A.1

How many minutes are between 9:43 AM and 10:00 AM?

• 17 minutes

• 15 minutes

• 43 minutes

• 60 minutes

Tags

CCSS.3.MD.A.1

What is the total elapsed time from 9:43 AM to 1:08 PM?

• 3 hours and 15 minutes

• 4 hours

• 3 hours and 25 minutes

• 4 hours and 25 minutes

Tags

CCSS.3.MD.A.1

In the second example, what is the correct way to simplify 3 hours and 82 minutes?

• 3 hours and 22 minutes

• 4 hours and 22 minutes

• 3 hours and 62 minutes

• 4 hours and 12 minutes

Tags

CCSS.3.MD.A.1

What additional step is necessary if the minutes sum up to more than 60?

• Convert all time to minutes

• Just subtract 60 from the minutes

• Subtract 60 from the minutes and add 1 to the hours

• No additional steps required

Tags

CCSS.3.MD.A.1

How many minutes are between 7:31 PM and 8:00 PM?

• 39 minutes

• 49 minutes

• 31 minutes

• 29 minutes

Tags

CCSS.3.MD.A.1

What is the final elapsed time from 7:31 PM to 8:15 PM?

• 34 minutes

• 44 minutes

• 45 minutes

• 1 hour and 15 minutes

Tags

CCSS.3.MD.A.1

How do you handle a situation where no time has passed between the start and end hour?

• Record it as 60 minutes

• Assume 1 hour has passed

• Skip the calculation

• Record it as 0 hours

Tags

CCSS.3.MD.A.1

What is the elapsed time from 11:46 AM to 1:58 PM?

• 2 hours and 22 minutes

• 3 hours

• 1 hour and 72 minutes

• 2 hours and 12 minutes

Tags

CCSS.3.MD.A.1

When using the Z method, what do you do if the minutes add up to more than 60?

• Convert the excess minutes into hours

• Subtract 100 from the minutes

• Leave the minutes as they are

• Reset the minutes to zero

Tags

CCSS.3.MD.A.1