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The aim of the research is to identify brain-based learning in mathematical power among female students of the first intermediate grade. The experiment was applied to a sample of (62) students, the experimental group (31) students, and the control group (31) female students of the first intermediate grade in secondary school (Al-Zariat for Girls). For the academic year (2020-2021), the two groups were equivalent in the variables (chronological age of female students calculated in months, intelligence test, previous achievement in mathematics, test of previous knowledge in mathematics), and the research tools represented in (mathematical strength test) were built. The test consisted of (30) objective items, and the validity of the test was verified and the reliability factor was acceptable, and the difficulty factor, discrimination and effectiveness of the wrong alternatives to the test items were good, and after the end of the experiment, the mathematical strength test was applied to each of the two groups (experimental and control). The t-test has been used to process the data. The results of the research showed that there is a statistically significant difference at the level of significance (0.05) between the mean scores of the students of the experimental group and the scores of the control group students in mathematical strength and in favor of the experimental group.
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