Posted in Education, Geometry, Math, MTBoS

“Upside Down” Triangle

I’ve incorporated Which One Doesn’t Belong tasks into my bellwork.  I love how they fit nicely into my Geometry lessons about definitions and saying what you mean and meaning what you say.  Given the image below, I was not expecting my students to write what they did about the upper left corner image.

Screen Shot 2017-09-12 at 12.16.24 PM.png

Students wrote some of the following statements:

  • the only upside down one
  • it is the only regular triangle <— especially shocking since we have worked with the term “regular” in this class already
  • the only normal one
  • different shaped triangle

I was shocked at how many students referred to the triangle as “upside down”.  It really made me think about how we represent triangles to our students.  I plan to do more work with showing multiple representations and pressing students to work on how they verbally express themselves.  How do you address this issue of “right side up” in your class?  I think it is really important especially when we head into concepts like area and perimeter.

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