context: The abacus was initially used for arithmetic tasks. The Roman abacus was used in Babylonia as early as 2400 BC. Since then, many other forms of reckoning boards or tables have been invented. In a medieval European counting house, a checkered cloth would be placed on a table, and markers moved around on it according to certain rules, as an aid to calculating sums of money.
question: మధ్యయుగ ఐరోపాలో ఏమి లెక్కించడానికి ఒక బల్లపై చెక్కబడిన వస్త్రాన్ని ఉపయోగించారు?
answers: sums of money