How do you know what time it will be in a few hours and a few

minutes?For example:

The clock shows 12:45. What time will it be in 2 hours and 10

minutes?

In this lesson, you will learn how to solve elapsed time

word problems in five-minute intervals by using a number

line.

Let’s Review

Start time

6:30am 7:30am 8:30am

End time

A Common Mistake

2:45 Start time

Change of time

End time

1:35+

1

08:3

Core Lesson

Tanya went to daycare. The clock said

9:15am when she arrived. When her

mother picked her up, the clock said

2:45pm. How long was Tanya at

daycare?

Start time

End time

Change of time

Core Lesson

5 minutes1 hour

2:45pm9:15am 2:15pm

5 hours, 30 minutes

Core Lesson

The clock shows 12:45pm. What time

will it be in 2 hours and 10 minutes?

Start time

End time

Change of time

Core Lesson

12:45pm

2:45 pm

2:55pm

5 minutes1 hour

In this lesson, you have learned how to solve elapsed time word problems in five-minute intervals by using a

number line.

Guided Practice

The pool closed at 4:45 pm. It was open for 7 hours and 15 minutes before it closed. When did it open?

Extension Activities

Write your own elapsed time word problem to the nearest five-minutes and ask a partner to solve for the unknown part.

Extension Activities

Gionni can jump rope for 3 minutes and 10 seconds without stopping. If he starts jumping at 11:15 am, what time will he stop?

Extension Activities

A flashlight batteries lasted for 10 hours and 19 minutes. If Lola turned the flashlight on at 3:35 am, what time did the batteries run out?

Quick Quiz

1) David started building a birdhouse at 6:15 pm. He finished at 7:05 pm. How long did it take him to build the birdhouse?

Quick Quiz

2) The 3rd grade went on a field trip for 3 hours and 25 minutes. If they left at 11 am, what time did they get back to school?