## Lesson: Figuring Elapsed Time

Developing the Concept

In the previous lesson, students learned to find elapsed time in hour intervals. Now they will explore elapsed time in five-minute intervals.

**Materials:** large clock with moveable hands for class display

**Preparation:** If a commercial educational clock is not available, make your own, or use Learning Tool 21 in the * Learning Tools Folder*.

**Prerequisite Skills and Background:** Students should know how to tell time to the hour and to five minutes.

**Wrap-Up and Assessment Hints**

Give students many opportunities to practice finding elapsed time on their own clocks. If commercial educational clocks for individual students are not available, give them copies of Learning Tool 21 from the *Learning Tools Folder* so they can make their own clocks. Encourage students to focus on the positions of both the minute hand and the hour hand when they find elapsed time. While this may be challenging for them at first, they will soon see the relationship between the movement of the two hands. When you assess students, have them count aloud as they find elapsed time in hours and five-minute intervals. This will help you better evaluate their understanding of the concept.