Roman numerals are in general quite easy and straightforward to work out but for more complicated calculations the ancient Romans would use an abacus calculating device.
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For the same reasons that we need to use maths today.
For addition, subtraction. division and multiplication purposes in the same way that we do maths today but they had their own system of numbers known as the Roman numeral system.
The pulley was used by the Romans to move large pieces of equipment and to create buildings. Pulleys were also used in the creation of weapons.
The same reason that people of other countries use maths.
good maths =)