How are greater roman numerals formed?

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Greater Roman numerals are formed using two methods.

Normally when writing a large Roman numeral such as 1,000,000 we would place a line over the letter "M". The line on top identifies the number needs to be multiplied by 1000.

M with a line = 1000 x 1000 = 1,000,000.

Now since we cannot place a line on top of a letter on a Computer, larger roman numerals are denoted with parentheses.

(M) = 1000 x 1000 = 1,000,000
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