00640naa#a2200193#i#4500001002200000005001700022011001400039100004100053101000800094102000700102200008200109210005100191215001000242608002700252675011300279700002000392700001900412856001500431EN\INFRA-M\bibl\2067520240507140557.2##a1998-1740##a20180424b2018####ek#y0engy0150####ca0#aRUS##aRU1#aFormation of Mathematical Concepts by Younger SchoolchildreneJournal article1#aMoscowcINFRA-M Academic Publishing LLC.d2018##a4 с.##aJournal article2local##aОбразование. Воспитание. Обучение. Организация досуга. 37zRUS#1aChirkovagN. I.#1aPavlovagO. A.4#anaukaru.ru