Ключевые слова: abacus, accountant, add, addition, antique, back, background, blue, business, calculation, classroom, closeup, colored, colorful, colors, colourful, colours, computer, concept, count, education, finance, financial, frame, green, isolated, learning, mathematics, money, numeric, office, old, orange, pink, plastic, red, retro, school, subtract, subtraction, tool, tools, toy, traditional, vintage, white, wood, wooden, yellow,