This video tutorial teaches how to solve elapsed time word problems using a number line. It begins with an introduction to the concept using a bus driver example, followed by a review of elapsed time concepts. The video highlights common mistakes in counting time and demonstrates solving word problems, such as a baby's nap time and a bus driver's schedule, by identifying start, end, and change of time.

What are the three parts of an elapsed time word problem?

• End time, duration, and change of time

• Start time, end time, and duration

• Start time, duration, and change of time

• Start time, end time, and change of time

When using a number line to count time, what comes after 12 p.m.?

• 2 p.m.

• 13 p.m.

• 12 a.m.

• 1 p.m.

What is a common mistake when using a number line to count time?

• Counting backwards instead of forwards

• Counting hours as minutes

• Skipping numbers

• Forgetting that the hour after 12 is 1

If a baby falls asleep at 1:10 p.m. and sleeps for two hours, what time will the baby wake up?

• 1:10 p.m.

• 4:10 p.m.

• 3:10 p.m.

• 2:10 p.m.

In the baby's nap example, what is the start time?

• 1:10 p.m.

• 3:10 p.m.

• 2:10 p.m.

• 12:10 p.m.

If a bus driver arrives at 8:30 a.m. after driving for two hours, when did he start driving?

• 9:30 a.m.

• 8:00 a.m.

• 7:30 a.m.

• 6:30 a.m.

In the bus driver example, what is the end time?

• 6:30 a.m.

• 7:30 a.m.

• 9:30 a.m.

• 8:30 a.m.

What is the change of time in the bus driver example?

• Three hours

• Two hours

• One hour

• Four hours

How do you find the start time if you know the end time and the change of time?

• Divide the change of time by the end time

• Multiply the change of time by the end time

• Subtract the change of time from the end time

• Add the change of time to the end time

What method is used to solve elapsed time word problems in this lesson?

• Using a calculator

• Using a number line

• Using a calendar

• Using a clock