The Roman numeral MMDCX is equivalent to 2610
It is nothing. That is not a roman numeral!
MCM
741
240
IV
This is roman numeral for the year 1800.
VI = 6
The Roman numeral MDCCCIXXIY has a numeric value of 1,820.
180
The Roman numeral of CM means -100+1000 = 900
The Roman numeral L represents the number 50.
In today's terms they represent 1697