About this resource:
I use this activity to emphasize that dilations can be reductions or enlargements. I print a few copies of pages 3-6, “Ugly Sweaters 1-4”, in color and laminate them. Those represent the “pre-image” for students to share while dilating. They can choose which ugly sweater they use, or you can choose for them!
I have students reduce the picture first individually. The “Reduce” page (pg7) has 4 copies per page for multiple printing purposes.
I then split the class into groups of 4 and have the groups complete “Enlarge 1”. There will be one page per person.
Finally, I split the class into groups of 9 and have the groups complete “Enlarge 2”. Again, there will be one page per person. Group sizes do vary, depending on class size from year to year, but I tend to let fast finishers do more than one page for their group, if needed.
The grids on Enlarge 1 and Enlarge 2 papers can be cut out and taped together to form larger ugly sweaters for display! Answer keys are included for all reductions & enlargements. My students love this activity AND my administrators love to see the finished products in the hallway!
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