It made people be more accurate and they didn't have to round the numbers off.
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Roman numerals are very difficult to do mathematics with, and do not work at all in advanced mathematics as the roman numeral system has no concept of zero, negative numbers, fractions, powers, or decimals.
Accountants use decimals by simply dividing the fractions and getting a decimal number. One does not need to be an accountant to use decimals.
The Arabs. Roman mathematics suffered from lack of a zero. They could not do multiplication or division.
Mathematics are important to LIFE because without mathematics how can you know the important things such as addition subtraction fraction multiplication division decimals ratios geometry percent area measuring and many other equations without mathematics??? that's why mathematics is important to our life...
decimals are most commonly seen in money.