The Megin dinghy's sail number may be written in Roman numerals on the sail.
The symbols
I = 1 · V = 5 · X = 10 · L = 50 · C = 100 · D = 500 · M = 1000.
How to read the number
Add the values from left to right. If a smaller value comes before a larger one, subtract it: IV is 4, IX is 9, XL is 40, XC is 90, CD is 400 and CM is 900.
- LXXXI = 81.
- CCXCII = 292.
- CDXXI = 421.