What is 9000 express in roman numerals?

Answer 1

9000 can be written in several ways. The Romans themselves would have probably just written "IX mille", just as we would write "9 thousand" today.

However, during the Middle Ages, a form of notation was developed using the original symbol for M (1000), which was CIƆ (which could also be notated as ↀ). From this we got IƆ (500) which went on to become D. However, the original notation could be extended such that CCIƆƆ became 10,000. Thus 9,000 could be notated with the subtractive notation:

CIƆ CCIƆƆ (10,000-1,000)

There are some that claim the C and Ɔ can be used to enclose any numeral, such that 9,000 could be more simply notated as:

CIXƆ (9 x 1000)

Or even:

(IX)

However, there is no evidence that this form of notation was ever actually used, even in the Middle Ages.

The confusion possibly arises from the fact the Middle Ages saw another form of notation using vertical bars rather than C and Ɔ, which did permit any value to be enclosed. However, rather than multiplying the value by 1,000, the bars only multiply it by 100. Thus 9,000 could be notated as:

|XC| (90 x 100)

Middle Age notation also permitted an overline to multiply the value by 1,000, thus 9,000 could also be written:

__

IX (9 x 1000)