da 7 Roman Numerals

Hello, every member in this conference
7 I Roman Numerals
You know that 2 + 2 = 4. But do you know that ii + ii = iv? I
The numbers that we normally use (1, 2, 3 etc) are called "Arabic numerals". But we sometimes use another system for writing numers - "Roman numerals". The Romans used letters of the alphabet to represent numbers, and you will occasionally see this system used for page numbers, clock faces, dates of movies etc. I
There are 7 letters used for Roman numerals: I
I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1000
In general, letters are placed in decreasing order of value, eg XVI = 16. Letters can be repeated one or two times to increase value, eg XX = 20, XXX = 30. Letters cannot be repeated three times, so XXXX is not used for 40. In this case, XL = 40 (50 minus 10).