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The Egyptians wrote numbers using the Arabic numeral system (our system) and the Romans used the Roman numeral system. (IVXLCDM)
As the Romans would write it: XXXX, as we usually write it: XL, written in decimal arabic: 40.
No. The ancient Romans didn't have numerals for ordinal numbers. If they wanted to write first they would have to write out the word 'primus', for second, 'secundus' and so on.
Today we would write it out as CXCIX but the Romans themselves probably wrote it out in an abridged version as ICC (200-1)
In today's notation of Roman numerals: MMCDLXXXVI but the Romans themselves would have probably chosen MMCCCCLXXXVI