00787naa#a2200181#i#450# EN\INFRA-M\bibl\67236 /en/manage/index 20250713191639.7 1998-0728 20230626b2023####ek#y0engy0150####ca RU Second Grader and Mathematics: Mastering the Subject Within the Framework of the Requirements of the Current Standard Journal article Moscow INFRA-M Academic Publishing LLC. 2023 6 с. Journal article local Первая ступень обучения. Начальная школа. 373.3 Содержание воспитания и обучения. 37.011.33 математики. 372.851 Rydze Oxana Anatol'evna test.editorum.ru /en/manage/index