IV ....if you put I in front of another roman numeral, it subtracts from that numeral. If you put the I after the other numeral, it adds to its value.
IV is 5-1=4
IX is 10-1=9
VI is 5+1=6
XI is 10+1=11
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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)
You write 1533 in roman numerals like this: MDXXXIII
To write 19000 in Roman numerals, combine the Roman numerals for 1000 (M) and 9000 (IX). Therefore, 19000 in Roman numerals is written as MXCM.
To write twenty in Roman numerals, you simply write the letter X.
CCCLX is the number 280 in roman numerals. This number is used to represent what roman used to write.