Ключевые слова: abacus, abstract, accounting, arithmetic, background, balance, balls, basic, beads, blue, business, calculate, calculation, calculator, color, colorful, colors, colourful, colours, concept, count, education, elem, green, kindergarten, learning, math, mathematics, maths, number, nursery, orange, primary, red, row, school, science, student, subtraction, texture, toy, traditional, vibrant, white, wood, wooden, yellow,