怎么识别罗马数字 zt

What are Roman Numerals?

Roman numerals is an ancient number system that is still used in many places. In roman numerals, alphabets are used to represent the fixed positive numbers. These roman numerals are I, II, III, IV, V, VI, VII, VIII, IX, and X represent 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10 respectively.

After 10, the roman numerals are followed by XI for 11, XII for 12, XII for 13, … till XX for 20. The most common roman numerals that are presently used to represent the basic numbers are given in the table below.

I	V	X	L	C	D	M
1	5	10	50	100	500	1000

Roman Numerals Chart (1 to 1000)

Below is the chart for roman numerals that shows the roman numerals from 1 to 1000 such as for 1, 2, 3, …, 10, 11, 20, 30, 50, 100, 500 and 1000. Using the chart, we can easily write roman numbers from 1 to 1000.

Students can download the pdf of the roman numerals chart for free from the link given below.

Roman Numerals 1 to 100 

Following is the list of Roman numerals or Roman numbers from 1 to 100. There are certain rules to write the roman letters from 1 to 100, which are explained here.

Number	Roman   Numeral	Number	Roman   Numeral	Number	Roman   Numeral	Number	Roman   Numeral	Number	Roman   Numeral
1	I	21	XXI	41	XLI	61	LXI	81	LXXXI
2	II	22	XXII	42	XLII	62	LXII	82	LXXXII
3	III	23	XXIII	43	XLIII	63	LXIII	83	LXXXIII
4	IV	24	XXIV	44	XLIV	64	LXIV	84	LXXXIV
5	V	25	XXV	45	XLV	65	LXV	85	LXXXV
6	VI	26	XXVI	46	XLVI	66	LXVI	86	LXXXVI
7	VII	27	XXVII	47	XLVII	67	LXVII	87	LXXXVII
8	VIII	28	XXVIII	48	XLVIII	68	LXVIII	88	LXXXVIII
9	IX	29	XXIX	49	XLIX	69	LXIX	89	LXXXIX
10	X	30	XXX	50	L	70	LXX	90	XC
11	XI	31	XXXI	51	LI	71	LXXI	91	XCI
12	XII	32	XXXII	52	LII	72	LXXII	92	XCII
13	XIII	33	XXXIII	53	LIII	73	LXXIII	93	XCIII
14	XIV	34	XXXIV	54	LIV	74	LXXIV	94	XCIV
15	XV	35	XXXV	55	LV	75	LXXV	95	XCV
16	XVI	36	XXXVI	56	LVI	76	LXXVI	96	XCVI
17	XVII	37	XXXVII	57	LVII	77	LXXVII	97	XCVII
18	XVIII	38	XXXVIII	58	LVIII	78	LXXVIII	98	XCVIII
19	XIX	39	XXXIX	59	LIX	79	LXXIX	99	XCIX
20	XX	40	XL	60	LX	80	LXXX	100	C

Students can download the pdf of roman numerals from 1 to 100 for free from the link given below.

Roman Numerals 100 to 1000

After practising the above list, you will be able to find the list of roman numerals from 100 to 1000 as well.

Number	Roman Numerals	Evaluation
100	C	100
200	CC	100 + 100
300	CCC	100 + 100 + 100
400	CD	500 – 100
500	D	500
600	DC	500 + 100
700	DCC	500 + 100 + 100
800	DCCC	500 + 100 + 100 + 100
900	CM	1000 – 100
1000	M	1000

From the above table, we can see how the roman numerals have been calculated and expressed alphabetically.

Roman Letters

The roman letters are English alphabets but not all the alphabets are roman alphabets. There are 23 roman alphabets out of 26 English alphabets, in which J, U and W are not considered as roman alphabets. Hence, the roman alphabets are:
A, B, C, D, E, F, G, H, I, K, L, M, N, O, P, Q, R, S, T, V, X, Y and Z. These roman letters are also called roman symbols.
For example, the year 2019 is written as MMXIX.

Rules to Write Roman Numerals

There are certain rules to be followed if we have to represent a number in roman numerals form. Please check the rules listed below.

• The value of the symbol is added to itself, as many times as it is repeated. (Eg. II – 2, XX – 20 and XXX – 30).
• A symbol can be repeated only for three times, for example XXX = 30, CC = 200, etc.
• Symbols V, L, and D are never repeated.
• When a symbol of smaller value appears after a symbol of greater value, its values will be added. For Example-  VI = V + I = 5 + 1 = 6.
• When a symbol of a smaller value appears before a greater value symbol, it will be subtracted. For Example-  IX = X – I = 10 – 1 = 9.
• The symbols V, L, and D are never subtracted, as they are not written before a greater value symbol.
• The symbol I can be subtracted from V and X only and symbol X can be subtracted from symbols L, M and C only.

Converting Roman Numerals to Numbers

Rule 1: If one or more symbols are placed after another letter of greater value, add that amount.

• VII = 7 (5 + 2 = 7)
• LXXX = 80 (50 + 10 + 10 + 10 = 80)
• MCCC = 1300 (1000+100 + 100 + 100 = 1300)

Rule 2: If a symbol is placed before another letter of greater value, subtract that amount.

• CM = 900 (1000 – 100 = 900)
• IX = 9 ( 10 – 1 = 9 )
• XC = 90 (100 – 10 = 90)

Rule 3: 1000 is replaced by a bar in the case of roman numerals

5000	10,000	50,000	100,000	500,000	1,000000
V¯	X¯	L¯	C¯	D¯	M¯

Subtractive Rule of Roman Numerals

Write	Instead of	For the value of
IV	IIII	4
IX	VIIII	9
XL	XXXX	40
XC	LXXXX	90
CD	CCCC	400
CM	DCCCC	900

 

所有跟帖： 

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• 我记得法国的数字60以上还要在心里做个加减法 -木有文化- ♂ (105 bytes) () 11/12/2022 postreply 11:58:34

• 怪不得，很多族群用了阿拉伯数字后，数学（算数/心算）就退步了……周末愉快 :)) -土豆-禾苗- ♂ (0 bytes) () 11/12/2022 postreply 12:04:46

• 法文六十到七十九做加法，八十到九十九要做了乘发再做加法，让人头晕脑胀 -polebear- ♀ (0 bytes) () 11/12/2022 postreply 16:50:25

• 是啊 -木有文化- ♂ (0 bytes) () 11/12/2022 postreply 18:29:16