@article {MATHEDUC.05694819,
    author       = {Campos, T\^ania Maria Mendon\c ca and Magina, Sandra Maria Pinto and Cazorla, Irene Mauricio and Santana, Eurivalda Ribeiro dos Santos},
    title        = {Additive structures in the first grades of basic education: a diagnostic study in different contexts. (As estruturas aditivas nas s\'eries in\'\i ciais do ensino fundamental: um estudo diagn\'ostico em contextos diferentes.)},
    year         = {2007},
    journal      = {Relime. Revista Latinoamericana de Investigaci�n en Matem\'atica Educativa},
    volume       = {10},
    number       = {2},
    issn         = {1665-2436},
    pages        = {219-239},
    publisher    = {Editi\'on Clame, M\'exico},
    abstract     = {Summary: The objective of this investigation was to carry out the diagnostic study of the domain of additive structures in two distinct contexts, taking the Theory of Conceptual Fields as a frame of reference. A total of 1803 1st to 4th grade elementary students participated from public schools in the states of Sao Paolo and Bahia in Brazil. They were given a written test, composed of 12 problems related to addition and subtraction operations, which involved situations of composition, transformation and comparison, using small numerical values. A growing trend in the percentage of correct answers was observed according to grade level although, at differing levels and rate in student from both states. The main conclusion was that students, by the end of the fourth year, still showed difficulty in solving problems on more complex additive structures.},
    msc2010      = {F32xx (C32xx D22xx)},
    identifier   = {2010b.00358},
}