Dilations 1

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SWBAT understand dilations with the origin as the center of dilation.

Big Idea

Biggie or Smalls? Set the foundation for students' understanding of dilations, and use Geogebra to illustrate.

Warm Up

10 minutes

Each day, students complete a warm-up that usually consists of spiraling the previous day's material, in addition to older material.  Warm-up problems also sometimes extend lessons that students have encountered before to more unfamiliar contexts.

For a video narrative about how I structure each lesson, and how the warm-up fits in, click here.

Play of the Day

40 minutes


10 minutes

For the huddle in this lesson, I like to review #4, since it has a scale factor that is not a whole number.  It gets kids to move away from just their instincts (double or triple is easy) to apply the idea of image over original, which yields a scale factor of 3/2.  It's also 1.5 times larger, which is a relatively simple concept for kids to master.  This sets the stage for even more fractions as scale factors.


15 minutes

Homework is to be completed at home and should take students approximately 15 minutes.