# Frequent question: How do you read percentile dice?

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## What does 00 mean on percentile dice?

The percentile dice (00, 10, 20, etc) starts at 00 and goes up to 90. So why would a roll of 00 and 9 equal 9, but a roll of 00 and 10 equal 100? It makes no sense to me. I think the simplest way of doing it is to say 00 is always a true 0 and the 10 on a d10 is always 10.

## What is 00 on a d100?

A 00-0 roll would, technically, be a straight up zero. Instead of a 1-100 scale, you’ve made yourself a 0-99 scale.

## How do you read dice rolls?

The first die represents the tens digit, and the second die the ones digit. For example, a roll of 1 followed by a roll of 5 will give a total of 15, while a roll of 3 followed by a roll of 6 will give a total of 36. The average result of the D66 is 38.5, and the standard deviation about 17.16.

## How do you use d10s?

You can also use this as a standard d10 just by using only the tens digit on each face. In any event, once you’ve decided which die is which digit, roll them both and combine them to get the result. If you’re rolling 2d10, then multiply the tens die’s result by 10 and then add them together.

## How does percentage dice work?

The numbers on the percent die represent themselves. 00 = 0 %, 90 = 90%, 60 = 60% and so on so on. We roll this die in addition to a D10, We take the number on the D10 and combine it with the percentage roll and that equals your percent total. Example: D% is rilled and a 30 comes up.

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## What happens if you roll a 0?

When you roll a d10 you see the total result and again, if you rolled a 0, that’s a 10.

## Is a D100 fair?

They are not fair, they cannot be made fair, and they do not produce the same probabilities as rolling 2d10. A d10 is a pentagonal trapezohedron, which is a symmetrical fair die. Even an imperfect d10 is far more fair than a d100 can be, due to the limits of design.