Bok
06-24-2011, 04:33 PM
Problems estimating quantities may underlie arithmetic cluelessness
More... (http://www.sciencenews.org/view/generic/id/331850/title/Math_disability_tied_to_bad_number_sense___)
More... (http://www.sciencenews.org/view/generic/id/331850/title/Math_disability_tied_to_bad_number_sense___)