Math: Practical Application

I decided, this year, to decorate my classroom with movie posters. I started with five and eyeballed their placement on the wall. Two days ago I picked up a poster for Harry Potter and the Deathly Hallows, and decided that I needed to even out the space on the wall.

I borrowed a tape measure from the library and came up with this:





Then, used that information to come up with this:





My first hour students balked at my explanation.


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