Increasing, Decreasing & Constant Intervals Guided Algebra Lesson Hands‑On Activity

Help students confidently identify increasing, decreasing, and constant intervals on a graph with this engaging, scaffolded algebra lesson. This resource blends visual warm‑ups, guided notes, interval notation review, and hands‑on practice to build a strong conceptual foundation for interpreting function behavior on the coordinate plane.

Students begin with a visual warm‑up to spark discussion about direction and change. Then they learn how to read graphs for increasing, decreasing, and constant intervals, followed by structured examples that model how to write intervals using correct notation. A cut‑and‑paste activity and practice worksheets reinforce learning and support mastery of this essential Algebra 1 skill. Perfect for introducing function behavior, reviewing interval notation, or strengthening graph‑reading skills.

What’s Included

• General Teacher Notes
• Warm‑Up Activity
• Guided Notes
• Cut‑and‑Paste Activity
• Practice Problem Worksheets
• Answer Key
• Zip File with 2 Versions:
• Open Interval Notation
• Closed Interval Notation

Prerequisite Skills

• Familiarity with the coordinate plane
• Interval notation is reviewed within the lesson

Materials Needed

Colored pencils or highlighters

 Key Features

• Clear introduction to increasing, decreasing, and constant intervals
• Visual warm‑up to build conceptual understanding
• Guided notes with examples using real function graphs
• Review of interval notation
• Hands‑on cut‑and‑paste activity for interactive learning
• Practice worksheets for skill reinforcement
• Two versions included: open interval notation and closed interval notation

Note: Two versions are included as some cirriculums use open interval notation for increasing and decrerasing intervals while others use closed interval notation.

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