Roman numbers or Roman numerals are a numerical system derived from ancient Rome, based on Etruria numerals. The Roman numeral system has been used since ancient times and by the Middle Ages, this numeral system was edited and used to this day.
Today, Roman numbers are often used in statements, watch faces, pages located in front of the main part of a book, chord notes in musical analysis, numbering the film's publication date, but successive political leaders, or namesake children, and numbering for certain activities, such as the Olympic Games and Super Bowl . To write and read Roman numerals is not difficult Since they all have certain rules, the difficulty here is to remember the value of the characters to distinguish which ones are smaller and smaller, then add and subtract. In the article below, Network Administrator will guide you how to write and read Roman numbers correctly. Invite you to follow along.
1. Numerals and writing Roman numbers
In the Roman numeral sequence there will be 7 basic digits, from which the user can add the following subtraction to the number you need: I = 1; V = 5; X = 10; L = 50; C = 100; D = 500; M = 1000
- As a general rule, the digits I, X, C, M will not be allowed to repeat more than 3 times on a calculation. And the numbers V, L, D can only appear once.
- Basic digits are repeated 2 or 3 times to indicate the value 2 or 3 times more.
For example:
I = 1; II = 2; III = 3
X = 10; XX = 20; XXX = 30
C = 100; CC = 200; CCC = 300
M = 1000; MM = 2000; MMM = 3000
- Rule of writing Roman numbers is a plus and a minus:
+ The number added to the right is added (less than the original number) and absolutely no more than 3 times the number.
For example:
V = 5; VI = 6; VII = 7; VIII = 8
If written: VIIII = 9 (incorrect), the correct writing will be IX = 9
L = 50; LX = 60; LXX = 70; LXXX = 80
C = 100; CX = 110; CV = 105
2238 = 2000 + 200 + 30 + 8 = MMCCXXXVIII
+ The numbers written on the left are usually subtracted, meaning that the original number minus the left number will produce the value of the calculation. Of course, the number on the left will be smaller than the original number so you can perform the calculation.
For example:
number 4 (4 = 5-1) written as IV
9 (9 = 10-1) Write as IX
number 40 = XL; + number 90 = XC
number 400 = CD; + number 900 = CM
MCMLXXXIV = 1984
MMXIX = 2019
When using the digits I, V, X, L, C, D, M, and the numerical groups IV, IX, XL, XC, CD, CM to write Roman numbers. From left to right the value of the digits and group of digits decreases.
Example: MCMXCIX = one thousand nine hundred and nine nine.
2. How to read roman numbers
As mentioned above: From left to right the value of the digits and group numbers decreases so we pay attention to the digits and groups of digits thousands to hundreds, tens and units (like reading numbers nature).
Example: Number: 2222 = MMCCXXII: thousands: MM = 2000; hundreds: CC = 200; tens: XX = 20; Unit units: II = 2. Reading is: Two thousand two hundred and twenty two.
Attention:
For larger numbers (4000 and above), a dash is placed on the beginning of the original number to indicate multiplication for 1000:
For very large numbers there is usually no uniform form, although sometimes two tiles or an underscore are used to indicate multiplication for 1,000,000. This means that the X underline (X) is ten million.
Roman numbers do not have a zero.
Here is the roman numeric table you can refer to:
1 = I
26 = XXVI
51 = LI
76 = LXXVI
2 = II
27 = XXVII
52 = LII
77 = LXXVII
3 = III
28 = XXVIII
53 = LIII
78 = LXXVIII
4 = IV
29 = XXIX
54 = LIV
79 = LXXIX
5 = V
30 = XXX
55 = LV
80 = LXXX
6 = VI
31 = XXXI
56 = LVI
81 = LXXXI
7 = VII
32 = XXXII
57 = LVII
82 = LXXXII
8 = VIII
33 = XXXIII
58 = LVIII
83 = LXXXIII
9 = IX
34 = XXXIV
59 = LIX
84 = LXXXIV
10 = X
35 = XXXV
60 = LX
85 = LXXXV
11 = XI
36 = XXXVI
61 = LXI
86 = LXXXVI
12 = XII
37 = XXXVII
62 = LXII
87 = LXXXVII
13 = XIII
38 = XXXVIII
63 = LXIII
88 = LXXXVIII
14 = XIV
39 = XXXIX
64 = LXIV
89 = LXXXIX
15 = XV
40 = XL
65 = LXV
90 = XC
16 = XVI
41 = XLI
66 = LXVI
91 = XCI
17 = XVII
42 = XLII
67 = LXVII
92 = XCII
18 = XVIII
43 = XLIII
68 = LXVIII
93 = XCIII
19 = XIX
44 = XLIV
69 = LXIX
94 = XCIV
20 = XX
45 = XLV
70 = LXX
95 = XCV
21 = XXI
46 = XLVI
71 = LXXI
96 = XCVI
22 = XXII
47 = XLVII
72 = LXXII
97 = XCVII
23 = XXIII
48 = XLVIII
73 = LXXIII
98 = XCVIII
24 = XXIII
49 = XLIX
74 = LXXIV
99 = XCIX
25 = XXV
50 = L
75 = LXXV
100 = C
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