This lesson comes from UEN.org (Utah Education Network), but I was introduced to it at a summer seminar (Utah Core Academy) that I went to a couple years ago.
Download the lesson: HERE
The lesson is called Candies R Us and students get to explore the concepts of surface area and volume as they try to make boxes for a candy store. Each candy = one unit and each box needs to fit 12 candies. Read the lesson for more more information.
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While you're here, you might want to download these little posters I made today:
Download posters: HERE