XXXXVI (10+10+10+10+5+1) XLVI (-10+50+5+1) VLI (-5+50+1) All of these forms of notation are acceptable but VLI is more preferable because fewer numerals are used. XLVI is the accepted way of...
"C" was used to write 100 by the Romans.
Romans wrote 10 as "X"
1666 = MDCLXVI
It is: LVI = 56