# Dilations 1

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## Objective

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.

40 minutes

## Huddle

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.

## Homework

15 minutes

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