The Roman numeral for 1 billion is represented by the symbol "M" with a horizontal line above it, which signifies a thousandfold increase in value. This symbol is derived from the Latin word "mille," meaning thousand. Therefore, the Roman numeral for 1 billion is written as "M̅."
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"m" = 1000, but every time you add a horizontal line above a symbol, you add 3 zeros/times it by 1000
The number 1 billion can be written as the Roman numeral [M] with a horizontal bar above it (which I can't write with my keyboard).
iiimcimcicvicmvicmivciiicvmcivivivmcmmicvivicmvmciviciciiiiicmvmvmmmmmmicimvcimvicivivvivicmvcivicmviicicicmmcicmvmvmcccimvicmciicimvmmvcicimmmm
to write seven billion in roman numerals you have to put 7000000000
((MMD))M = 2,500*10,000*1,000 = 25,000,000,000 or 2.5*1010 in scientific notation
1 = I as a Roman numeral