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Roman numerals are a numerical system used in ancient Rome and are still in common use today.
Roman numeral symbol
I 1
Two-two
Three-three
Four-four
Five to five levels
VI - 6
Seven to seven days
Eight-eight
Nine to nine
x– 10
Xi– 1 1
XII– 12
XIII– 13
XIV– 14
XV– 15
XVI– 16
XVII– 17
XVIII– 18
XIX– 19
XX–20
XXI–2 1
Twenty-two to twenty-two years old
28-
28
XXIX - 29
XXX - 30
XL - 40
L - 50
LX - 60
LXX - 70
LXXX - 80
XC - 90
XCIX - 99
C - 100 centum
CI - 10 1 centum
et unus
CXCIX - 199
CC - 200
CCC - 300
CD - 400
D - 500
DCLXVI - 666
M - 1,000
MCMXCIX- 1.999
MM-2000
Um-
3,000
MMMM-4000
MMMMCMXCIX-4999
5000 pounds
spelling rules
There are seven Roman numerals * * *, which are I( 1), V(5), X( 10), L(50), C( 100), D(500) and M (10). Any positive integer can be expressed according to the following rules.
Repeat several times: 1 Roman numeral is repeated several times, indicating several times of this number.
Add right and subtract left: write a smaller Roman numeral to the right of the larger Roman numeral, indicating that the larger number is added with the smaller number. Write 1 the smaller Roman numeral to the left of the larger number, indicating that the larger number reduces the number. However, the left subtraction cannot span one digit. For example, 99 can't be represented by IC, but only by XCIX. In addition, the minus sign on the left cannot exceed 1 digit, for example, 8 is written as VIII instead of IIX. Similarly, the number added to the right cannot exceed 3 digits. For example, 14 is written as XIV instead of XIIII.
Add lines and multiply by thousands: add 1 horizontal line above 1 Roman numeral or write m at the bottom right, which means that this number is multiplied by 1000, which is 1000 times the original number. Similarly, if there are two horizontal lines on it, it is 1000000 times the original number.
Company limit: the same company can only appear three times. For example, 40 cannot be expressed as XXXX, but as XL. However, because IV is the initial word of IVPITER (there are no J and U in the ancient Roman alphabet), IIII is sometimes used instead of IV.
annual report
When Roman numerals are used in chronology, their spelling rules are the same as numbers.
use
Public memorial building
clocks and watches
calendar
Year of TV program production
There are seven Roman numerals * * *, which are I( 1), V(5), X( 10), L(50), C( 100), D(500) and M (10). Any positive integer can be expressed according to the following rules.
Repeat several times: 1 Roman numeral is repeated several times, indicating several times of this number.
Add right and subtract left: write a smaller Roman numeral to the right of the larger Roman numeral, indicating that the larger number is added with the smaller number. Write 1 the smaller Roman numeral to the left of the larger number, indicating that the larger number reduces the number. However, the left subtraction cannot span one digit. For example, 99 can't be represented by IC, but only by XCIX. In addition, the minus sign on the left cannot exceed 1 digit, for example, 8 is written as VIII instead of IIX. Similarly, the number added to the right cannot exceed 3 digits. For example, 14 is written as XIV instead of XIIII.
Add lines and multiply by thousands: add 1 horizontal line above 1 Roman numeral or write m at the bottom right, which means that this number is multiplied by 1000, which is 1000 times the original number. Similarly, if there are two horizontal lines on it, it is 1000000 times the original number.
Company limit: the same company can only appear three times. For example, 40 cannot be expressed as XXXX, but as XL. However, because IV is the initial word of IVPITER (there are no J and U in the ancient Roman alphabet), IIII is sometimes used instead of IV.