Problems Dealing With Unknown Quantities and Two Different Levels of Representing Unknowns
Eugenio Filloy, Teresa Rojano, and Armando Solares
January 2010, Volume 41, Issue 1, Page 52
centers on studying the progress of algebraic syntax once students have
surmounted initial obstacles found in the transition toward symbolic algebra.
It specifically analyzes students’ progress concerning the operation on the
unknown, when the latter is represented by an expression that involves a 2nd
Problem Solving / Problem Posing