[br][br][b]1.[/b]      Based on the effect size analysis, the difference between the mean scores of the experimental and control students in Bayankhongor and Ulaanbaatar cities shows that the experimental group performed[br]better than the control group. [br][br][b]2.[/b]      Values ​​of d = 0.56 and d = 0.62 show that using GeoGebra content has a positive effect on the student's mathematics performance.[br][br][br]