Ключевые слова: abacus, abacus classroom, arithmetic, background, background material, board, bookkeeping, boy, business, calculate, character space, childhood, children, class, classroom, commerce, concept, copy space, count, education, elementary, elementary school, finance, financial, free space, glasses, image, indoor, learning, lessons, math board, mathematics, mental, mental arithmetic, mental calculation, oldstyle, pencil, school, school life, student life, study, table, test, text space, traditional, uninhabited, unmanned, white, white background, white bag,