1 billion in roman numerals is 'm' with two horizontal lines above it:
=
m
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The largest number to be denoted by a single letter was 1,000 (M). So I suppose a billion would be M repeated a million times!
to write seven billion in roman numerals you have to put 7000000000
The 1 in Roman numerals is represented by the letter "I".
Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.
21 in Roman numerals is XXI. 1 in Roman numerals is I. 90 in Roman numerals is XC. So, 21 1 90 would be XXI I XC in Roman numerals.