## Lesson: Range and Mode

Introducing the Concept

Last year, students represented and compared data using tally marks. This year, have students focus on making connections between tally marks and visual representations of the data.

** Materials:** pictograph, tally chart, vertical bar graph, and horizontal bar graph showing the number of students with birthdays in each month of the year

** Preparation:** Draw the pictograph, tally chart, and bar graphs on a transparency for the overhead projector, or draw them on the board.

** Prerequisite Skills and Concepts:** Students should have basic counting skills. Students should be able to organize and interpret data.

Display the tally chart, pictograph, and bar graphs for all students to see.