00634naa#a2200169#i#450# EN\INFRA-M\bibl\52563 20240713181825.6 1998-0728 20220831b2022####ek#y0engy0150####ca RU First Grader and Mathematics: Features of Teaching According to the Updated Standard Journal article Moscow INFRA-M Academic Publishing LLC. 2022 6 с. Journal article local Народное образование. Воспитание. Обучение. Организация досуга. 37 Rydze Oxana Anatol'evna naukaru.ru