This engaging lesson is designed to help students identify and describe intervals where a function is increasing, decreasing, or remaining constant. The lesson begins with a visual warm-up activity to prompt discussion about direction and change. Students are then introduced to the concepts of increasing, decreasing, and constant intervals using graphs, followed by a review of interval notation. Guided examples provide structured support as students practice writing intervals based on the behavior of a function.

To reinforce learning, students complete a hands-on cut-and-paste activity, as well as additional practice worksheets to solidify their understanding of this key algebra concept.

Standards:

CCSS.MATH.CONTENT.HSF.IF.B.4

Prerequisite Skills: Students should be familiar with the coordinate plane and inequalities graphed on the number line. Interval notation is reviewed as part of the lesson.

Materials Needed: Colored Pencils or highlighters

What's Included?

• General Teacher Notes
• Warm Up
• Guided Notes
• Cut and Paste Activity
• Practice Problem Worksheets
• Answer Key
• Zip File with 2 Versions Included since some textbooks use open intervals for increasing and decreasing functions while others used closed intervals:

1) Open Interval Notation 2) Closed Interval Notation

You also might be interested in:

• Key Features Workshop Mini Lesson Stations Activity
• Grab a copy of this whole unit, the Key Features Bundle!