KhazrajiInstr. Ph.D., Nidhal. “The Effect of Strategy Ofsimilarities in the Development of Visual Thinking for Mathematics at the Primary School Pupils”. ALUSTATH JOURNAL FOR HUMAN AND SOCIAL SCIENCES, no. 225 (3) (June 1, 2018): 55-76. Accessed November 20, 2019. http://alustath.uobaghdad.edu.iq/index.php/UJIRCO/article/view/202.