00639naa#a2200169#i#450# EN\INFRA-M\bibl\55659 20240914182635.6 1998-0728 20221226b2022####ek#y0engy0150####ca RU On the Initial Stage of the Formation of Cognitive Universal Educational Activities in First-Graders in Mathematics Lessons Journal article Moscow INFRA-M Academic Publishing LLC. 2022 7 с. Journal article local Общеобразовательная школа. Дошкольные учреждения. 373 Fedorova A. naukaru.ru