You Roman numbers belong to anumbering system what uses seven letters to representto them.ANDThese letters, when combined in different ways, represent different numbers. With this combination, we can represent any numerical quantity, but, for this, we must know some rules.
Read too: Decimal numbering system - base 10 number system
Roman numeral rules
Roman numerals are written usingseven letters of our alphabet, and each one of them represents a quantity, that is, we can associate these letters with the Indo-Arabic numbers. Look:
Rule 1 – The letters I, X, C and M can be repeated a maximum of three consecutive times. With this rule and the table above, see how we can write some roman numbers.
Rule 2 – The letters I, X and C can be written in front of or behind others. when they are written atfront, we must add the values from them, now, if they are written back on the other, we must subtract their value.
Note that in the following examples, the letters are located n.ahead of the others, so we must addyour values.
Now see that each letter it is behind theand another letter and what, therefore, we must subtract the values.
Rule 3 – The third and last rule is used to represent numbers greater than 3000. When we put a slash underre the letters, we must multiply their value by 1000.
See too: Ordinal numbers - numbers that indicate order or position
Table with numbers from 1 to 1000
Now that we know all the rules for writing Roman numbers, let's write some of them.
I → 1 |
X → 10 |
C → 100 |
II → 2 |
XX → 20 |
CC → 200 |
III → 3 |
XXX → 30 |
CCC → 300 |
IV → 4 |
XL → 40 |
CD → 400 |
V → 5 |
L → 50 |
D → 500 |
VI → 6 |
LX → 60 |
DC → 600 |
VII → 7 |
LXX → 70 |
DCC → 700 |
VIII → 8 |
LXXX → 80 |
DCCC→ 800 |
IX → 9 |
XC → 90 |
CM → 900 |
M → 1000 |
Knowing now this table, we can write any roman number combining the letters with the rules already mentioned.
