Solving Elapsed Time Word Problems

This video tutorial teaches how to solve elapsed time word problems using a number line. It begins with an introduction to the concept and reviews previous knowledge of solving problems to the nearest hour and five minutes. The tutorial highlights common mistakes, such as incorrectly adding time, and provides two example problems: calculating the cooking time of lasagna and the duration of a birthday party. The video emphasizes using a number line to accurately determine elapsed time in one-minute intervals.

What is a common mistake when solving elapsed time problems?

• Subtracting the end time from the start time

• Counting by fives

• Using a number line

• Adding the change of time directly to the start time

Why is adding the change of time to the start time not a good strategy?

• It's too time-consuming

• It can lead to incorrect time formats

• It requires a calculator

• It's too easy

At what time did the lasagna start cooking?

• 5:15 PM

• 7:23 PM

• 6:35 PM

• 6:31 PM

How many minutes did it take for the lasagna to cook?

• 1 hour

• 37 minutes

• 52 minutes

• 45 minutes

What strategy is recommended for solving elapsed time problems?

• Guessing the end time

• Using a number line

• Using a digital clock

• Adding time directly

What is a 'friendly number' in the context of solving elapsed time problems?

• The end time

• A number divisible by 5

• A prime number

• The start time

How did the teacher suggest counting to solve the lasagna cooking problem?

• By tens

• By ones, then by fives

• By fives, then by ones

• By hours

What was the start time of the birthday party?

• 7:23 PM

• 5:15 PM

• 6:52 PM

• 6:15 PM

How long did the birthday party last?

• 52 minutes

• 1 hour 37 minutes

• 2 hours

• 1 hour 45 minutes

What was the final step in calculating the duration of the birthday party?

• Adding up the minutes

• Counting by fives and ones

• Subtracting the start time from the end time

• Using a digital clock