m and two horizontal lines above it:
=
m
There are many but roman numerals refer tohindu arrabic numerals
XLV in roman numerals = 45
Many do, but not all clock towers use roman numerals.
Because many peoples in many countries are not knowing Roman numerals, so we didn't use Roman everywhere.
The equivalent of the given Roman numerals are 10, 100 and 5 respectively
The answer depends on how many more millennia they keep using Roman numerals!
They are easier to use then the Roman numerals. And the Roman number system did not contain a zero. This made it difficult for them to develop many mathematical concepts.
Three billion has nine zeros. It is written as 3000000000 in numerals.
Basically they are used to dignify and differentiate. For example, the cornerstone of a building many times has Roman numerals, the names of royalty have Roman numerals, such as Elizabeth II, some watches and clocks, especially grandfather clocks, many times Roman numerals are used in the introduction to books to differentiate them from the standard page numbers.
1975
XLVI
There are 3 of those numerals and they are: x,x1,x11,cx