%0 Journal Article
%A Izadi, Mehdi, Reyhani, Ebrahim
%T Investigating the understanding of Tehran’s second elementary school students of the fraction’s part- whole subconstruct, based on APOS and SOLO theories with using an unusual task
%J Research in Curriculum Planning
%V 18
%N 68
%P 124-141
%D 2021
%R 10.30486/jsre.2021.1875155.1435
%U https://sanad.iau.ir/fa/Article/900551