## Lesson: Range and Mode

Developing the Concept

Once students feel comfortable analyzing bar graphs, pictographs, and tally charts, they are ready to learn about two special numbers that summarize data. Introduce two vocabulary terms: **mode** and **range**.

** Materials:** one sticker for each student

** Preparation:** none

** Prerequisite Skills and Concepts:** Students should have basic counting skills and be familiar with time lengths in hours. Students should be able to interpret data.

Draw the grid for a bar graph on the board. At equal intervals, write the following categories: 0 hours, about 1 hour, about 2 hours, about 3 hours, and about 4 hours.

**Wrap-Up and Assessment Hints**

Display a line plot that shows the number of pets in ten families. Have students find the mode and the range of the data. Remind them to subtract to find the range. Discover how they found the mode and range. Be sure to encourage students to use number sense in finding their answers as they analyze the graph.