Ключевые слова: abstract, aid, background, basic, calculate, calculation, child, childhood, classroom, colorful, digit, draw, education, educational, eight, five, four, idea, illustration, investigate, knowledge, learn, lesson, level, material, math, mathematical, mathematics, memorize, multiplication, multiply, nine, numbers, one, poster, primary, school, science, seven, square, study, studying, table, teach, ten, three, tool, two, write,