M = 1000 (IV) = 4000 (X) = 10,000 (L) = 50,000 (C) = 100,000 (D) = 500,000 (M) = 1000,000 Any number between can be written using the same formula, for example 743,521 would be written as (DCCXLIII)DXXI or as (DCCXL)MMMDXXI
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"M" = thousand (from Roman numerals) "MM" = thousand thousand = million
____ MCD
(MDCCL) and ((MDCCL)) respectively Numerals in single brackets indicate multiplication by a thousand and numerals in double brackets indicate multiplication by ten thousand. Hence: (MDCCL) = 1750*1000 = 1,750,000 = 1.75*106 in scientific notation ((MDCCL)) = 1750*10,000 = 17,500,000 = 1.75*107 in scientific notation
Four million in Roman numerals is MMMM but with an horizontal bar above each of the four numerals to indicate multiplication by a thousand (4000*1000 = 4000000)
| li | lxx