A modern person in everyday life is constantly faced with numbers and numbers: we remember bus and phone numbers, calculate the cost of purchases, keep a family budget in rubles, kopecks (hundredths of a ruble), recalculate Russian rubles into dollars and euros, and vice versa, etc. Numbers, numbers - they are with us everywhere. And what did a person know about the numbers before? The initial ideas about the number of people had more in the most ancient period of the Stone Age - the Paleolithic.