An abacus is a counting device that uses beads on a table or string that represent numbers. The device is divided into columns, each column representing a multiple of 10 (x10, x100, x1000 etc.) and each column has 10 beads in it. This enables numbers to be formed by rearranging the beads, this means that simple and complex arithmetic can be performed on the abacus.
The abacus was invented around 2,700-2,300 BCE, by the Sumerians (Mesopotamia) ; that makes the invention about 4,400 years old
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a roman abacus was used as a pocket calculator for the romans, helping them calculate roman numerals
roman plantations == latifundia
Roman should always be capitalized because it is a proper noun.
48 in Roman Numerals is XLVIII.
It was Roman Catholics who settled in the area that King Charles I had given to George Calvert. Charles I of England lived from 1600 to 1649.
Most of the people in the Holy Roman Empire spoke german. It's perhaps worth noting that the Holy Roman Empire (Somebody said this) is not holy, roman or an empire !