Ключевые слова: arithmetic, building, c construction, calculating, calculus, child, colorful, count, counting, creativity, design, development, draw, elementary, exercise, game, isolated, joy, kid, knowledge, learn, learning, leisure, lesson, line, math, mathematic, mathematical, number, play, playground, playing, preschool, school, schooling, stick, sticks, structure, studio, teach, teaching, wave, wooden,