Ключевые слова: account, arithmetic, back, background, beautiful, black, blank, board, book, caucasian, chalk, chalkboard, child, childhood, children, class, concept, cute, drawing, education, elementary, equations, face, fun, funny, girl, grade, hard work, important, knowledge, learn, lesson, life, little, math, math class, numbers, person, school, schoolboy, schoolgirl, smart, solution, student, study, work, writing, young, youth,