For dividing they spelled it out for example, two-sevenths was "duae septimae" and three-eighths was "tres octavae."
For multiplying they put horizontal a dash or line over the numeral and multiply by a thousand ......
I believed there was nor subtracting or adding just adding on or taking off numerals.
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Yes, although they look different from what we're used to seeing they are still numbers
Yes the ancient Romans were able to add, subtract, divide and multiply They also had their own numeracy system known today as Roman numerals
Yes
yes
To subtract in Roman numerals, you simply place a smaller number in front of a larger one. You subtract the value of the smaller number from the larger one. For example, to express 4 in Roman numerals, you write IV (5-1). Similarly, to express 9, you write IX (10-1).