TY JOUR TI The Use of Non-Standard Problems with Matches When Teaching Younger Schoolchildren KW Primary School KW methods of teaching mathematics KW non-standard tasks KW symbolic means of information presentation KW classification of problems with matches KW modeling KW development of abilities for independent intellectual activity JO Primary Education AU Pavlova, O.A. AU Surovceva, A.O. AU Yakushkina, E.V. PY 2021 IS 9 PB INFRA-M Academic Publishing LLC.