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XIV Roman Number


How to write roman numbers (numerals) ?

1. Express in letters
Roman numbers are expressed by letters. Here is the list of letters used, with thier equivalent values :
i 1
v 5
x 10
l 50
c 100
d 500
m 1000

2. Repeat letters
You can repeat a letter, but not more than three times, and its value is added as many times as it repeats.
ii 2
xx 20
xxx 30
ccc 300

3. v, l and d are never repeated
Means you can't write vv, vvv, ll, lll, dd, ddd.

4. Addition
If a letter of smaller value is written just after a letter of greater value, its value gets added to the value of greater letter.
vi 5+1 6
xi 10+1 11
xii 10+2 12
xxxiii 30+3 33

5. Subtraction
If a letter of smaller value is written just before a symbol of greater value, its value is subtracted from the value of the greater symbol.
iv 5-1 4
ix 10-1 9
xl 50-10 40
xc 100-10 90

6. Don't repeat a letter of smaller value before a letter of greater value.
Here are some examples:
Number Correct Wrong
8 viii iix
18 xviii xiix
80 lxxx xxc

7. Don't repeat a letter of greater value after a letter of smaller value.
Here are some examples:
Number Correct Wrong
19 xix ixx
18 xviii iixx

8. v, l and d are never written before a letter of greater value.

9. i can be subtracted from v and x only.
    x can be subtracted from l and c only.
    c can be subtracted from m only.

See all roman numbers from 1 to 3888