Edmonton teacher, Leslie Friesen, passed on this interesting article from Scholastic. The author makes a good case for using the different pieces of the popular Lego sets to illustrate fractions in different ways. There are some printables to help students use the manipulatives. I thought it was good advice given to pre-pack the pieces you need in a bag rather than give the set out.
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The URL: http://www.scholastic.com/teachers/top-teaching/2013/12/using-lego-build-math-concepts