Ключевые слова: abacus, accounting, accounts, addition, ancient, antique, arithmetical, asia, asian, background, bar, bead, brown, business, calculate, calculation, calculator, chinese, closeup, compute, computer, count, counting, device, dusty, education, equals, equipment, finance, financial, frame, instrument, learning, math, mathematical, mathematics, maths, metal, money, movable, numbers, numerical, object, old, retro, rows, school, series, single, solve, subtract, subtraction, tool, traditional, vintage, white, wood, wooden, work,