Glenda Lappan or Betty Phillips at Michigan State University. They write =
curriculum for Middle School students with a concrete to numerical to =
graphical to symbolic approach. Glenda is one to bring manipulatives to =
all of her classes she teaches at State. She or Betty should be able to =
point you in a direction toward some published reasearch.
I think their email addresses are the following.
glappan@math.msu.edu
bphillips@math.msu.edu (ephillips@math.msu.edu
Beth
Hentges
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