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The aim of the current research is to identify (the active mathematical processes in the brain included in the mathematics book for the fourth scientific grade) and in order to achieve the objectives of the research, the research community was identified and it is from the mathematics book for the fourth scientific grade ((12th ed , 2019), The book's sample size was (145 out of 156 pages), a list of effective mathematical operations for each side of the brain was identified, and the indicators were placed on them. The content of the book was analyzed according to the prepared list and its indicators, after it was presented to a group of arbitrators in the methods of teaching mathematics and psychology. The appropriate statistical analyzes were conducted to analyze the content (using Holstey equation) and the results showed that the percentage of active mathematical operations in the brain for the left side was (78%) and for the right side was (2%) and for both sides it was only (20%) and accordingly the researcher recommended:
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