TY JOUR TI Exercises and Didactic Games for Mental Development of Junior Schoolchildren KW analysis KW comparison KW abstraction KW differentiation KW objects size KW shape and color recognition KW spatial and logical reasoning KW attentiveness and keenness of observation KW memory improvement. JO Primary Education AU Savostyanov, A.. PY 2014 IS 2 PB INFRA-M Academic Publishing LLC.