Hakimova Marjona Iskandarzoda, Dots. Normo`minov Sherzod To`ychiyevich. MENTAL ARITHMETIC IN ELEMENTARY SCHOOLS. Spec. Jour. of Inno. Ref. and Dev. [Internet]. 2024 Feb. 18 [cited 2024 Nov. 7];24:94-6. Available from: https://sjird.journalspark.org/index.php/sjird/article/view/962