Dilation in Math Lesson Plan

Instructor: Artem Cheprasov

Artem has a doctor of veterinary medicine degree.

This lesson uses two activities, numerous discussion questions, and a quiz that will help your students learn and apply the concept of dilation in math.

Learning Objectives

After this lesson, students need to be able to:

  • understand the concept of dilation
  • accurately apply a scale factor to a figure in a (non)-coordinate plane


45-90 minutes without the activity


  • Visual examples of pre-images and images as well as their scale factor
  • Coins
  • Dice
  • Rulers
  • Graphing paper

Curriculum Standards

  • CCSS.Math.Content.HSG.SRT.A.1

Verify experimentally the properties of dilations given by a center and a scale factor:


Translate quantitative or technical information expressed in words in a text into visual form (e.g., a table or chart) and translate information expressed visually or mathematically (e.g., in an equation) into words.


Initiate and participate effectively in a range of collaborative discussions (one-on-one, in groups, and teacher-led) with diverse partners on grades 9-10 topics, texts, and issues, building on others' ideas and expressing their own clearly and persuasively.

Key Terms

  • Dilation
  • Scale factor


Warm Up

  • Ask these question to warm up your class:
    • Can you name some transformations we use in geometry?
    • What do you think dilation does to a figure?


  • Play the following video lesson for your class: Dilation in Math: Definition & Meaning. During the video lesson have students:
    • Take notes on the material
    • Highlight key terms and topics
    • Jot down any questions they still have about the material
  • Pause at 1:56, ask:
    • What changes during the dilation of a figure?
    • What doesn't change during the dilation of a figure?
    • What two things do you need in order to complete a dilation?
    • Show some more visual examples of pre-images and images as well as their scale factor.
  • Play the rest of the video now.
    • Go over some additional examples of dilations on a (non)-coordinate plane with your class up on the class board.
  • Have your students take the lesson quiz after the discussion has been completed.
  • Once everyone has finished the quiz, review all the questions and answers with the class.

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