If you mean: 110, 100 and 1000 then they were written as CX, C and M respectively
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1 = I, 10 = X, 100 = C and 1000 = M
As a Roman numeral 1000 = M
In roman numerals, numbers greater than 3999 use parentheses around, or a horizontal line above, the numbers that are to be multiplied by 1000. Writing 3999 can be written as MMMCMXCIX, but the number 4010 would be written as (IV)X. Therefore, the number 300,000 is written as (CCC) which represents 300*1000
It is: (M)M which means 1000*1000*1000 = 1,000,000,000 In all reality the ancient Romans had little need for such large numbers
It could be: (DCCXXV)M(CC) = 1000*725*1000+1000*200 = 725,200,000 But in all reality the Romans had little need for such large numbers.