00542naa#a2200181#i#450# EN\INFRA-M\bibl\1536 /en/manage/index 20250126053349.7 1998-0728 20140217b2014####ek#y0engy0150####ca RUS RU Division of sum by number (mathematics lesson in the 4th Grade) Journal article Moscow INFRA-M Academic Publishing LLC. 2014 5 с. Journal article local Semikopenko L. Yu. fht.editorum.ru /en/manage/index