00647naa#a2200169#i#450# EN\\bibl\96797 20250514050113.3 2949-1258 20250416b2025####ek#y0engy0150####ca RU Fifth-grade metacognitive development program for the effectiveness of studying mathematics Journal article Vladivostok Vladivostok State University 2025 12 с. Journal article local Народное образование. Воспитание. Обучение. Организация досуга. 37 Chernyavskaya Valentina S. vvgu.editorum.ru