Today's post is a gaming related one. For the game I run I only use 20-sided and 6-sided dice. I do this for a number reasons. Number 1, practicality. Having one, two dice to select from for any mechanical procedure reduces the choice of which dice to use to two from five or more (d4, d6, d8, d10, d12, d20 et alia). Number 2, nostalgia. The oldest rulesets for Dungeons & Dragons used, primarily, 6-sided and 20-sided dice. (As a matter of fact, before the 20-sided -- so I've read -- a bag full of chips numbered 1 through 20 were used.)
I am fond of the Percentile Die procedure (two 10-sided dice or an actual 100-sided die) as I use a number of procedural elements that would best function with the 100 spread. In addition, many very interesting game procedures and resources utilize the Percentile Die. Such as this one right here by Zak from Playing D&D With Porn Stars.
So, I have developed a procedure to generate the percentile with the 20-sided die. It is nothing of genius and I am sure I probably picked it up from somewhere, but forgot the source.
Dani's Procedure for Generating the Percentile (the 100) Using the 20-sided Die1. Roll one 20-sided die.
2. If the die reads 11-20, the ones digit is the tens digit of the percentile.
3. Alternatively, if the die reads 1-10, the ones digit is the ones digit of the percentile.
4. Roll the same die again. The ones digit becomes the remaining digit (ones or tens) of the percentile.
So, there you have it.