Interactivate: Elapsed Time

In this lesson, students will learn about elapsed time and how to find the elapsed time given the starting and ending time.

Upon completion of this lesson, students will:

Arithmetic: Students must be able to:
- complete simple addition
Technological: Students must be able to:
- perform basic mouse manipulations such as point, click and drag
- use a browser for experimenting with the activities

Students will need:

addition	The operation, or process, of calculating the sum of two numbers or quantities
elapsed time	A period of time that has passed, usually between a given starting time and ending time

Focus and Review

Open the lesson with this question, replacing times to make it more authentic:

Objectives

Let the students know what they will be doing and learning today. Say something like this:

Today, class, we are going to learn what elapsed time is and how to calculate it.
We are going to use the computers to do this but please do not turn your computers on until I ask you to. I want to show you a little about this activity first.

Teacher Input

Guided Practice

Have the students draw starting and ending times on their Elapsed Time Record Sheet. Then instruct them to calculate the elapsed time.
Open your browser to the Elapsed Time applet. Explain to the students how to work the applet.

Independent Practice

Have students answer 10 problems on their own.
Have the students answer the Exploration Questions while working with the applet.

Closure

Discuss as a class what the students discovered while answering the exploration questions.

If there is only one computer, this lesson can be modified in the following ways:

The teacher can prepare problems by given students various starting and ending times. The students can then discuss methods for finding elapsed time.
Students who need additional help can use the applet after completing the problems on paper.

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