Ключевые слова: alphabet, arithmetic, book, business, calculate, calculator, challenge, childhood, close, color, colorful, count, counting, design, educated, education, educational, examination, fun, game, graduation, isolated, kid, kindergarten, learn, learning, lesson, letter, magnet, math, mathematic, number, numeracy, piece, play, plaything, preschool, school, schooling, student, symbol, teach, teacher, toy, university, up,