How to roll 100:

  • take 10 sided die, roll once
  • take that number and multiply by 10
  • roll 10 sided die again
  • add that to the number from #2
  • add 1 (otherwise it would be 0-99, not 1-100)
  • How do you get “1” like this?

    I suppose you have to roll 10 to get to 100 = 0

    But then what?

    Modify step 2 so you subtract 1 from the roll first, then multiply by 10. That way if you roll a 1, the 10’s digit becomes a 0.
    Then you get 1 to 99

    You get 100 when you roll 10 twice

    (1d10 - 1) * 10 + 1d10 -> (10 - 1) * 10 + 10 = 9 * 10 + 10 = 90 + 10 = 100

    Then you switch to a system where you don’t add the 1, interpreting 00 as 100

    Alternatively:

    Roll a percentile die and a d10 together. Done.

    that’s exactly what I said, also you’d still need to add 1 to make rolling 100 possible
    Well, no, that’s not exactly what you said. And rolling with a percentile die means you do not need to add anything. A result of 00 and 0 is the 100. And your way makes rolling a 1 impossible.
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    that is a different way of doing it I didn’t think about but my method still works

    to roll 1:
    1st, 0 x 10 = 0
    2nd, 0+0 = 0
    add 1, 0 + 1 = 1

    to roll 100:
    1st, 9 x 10 = 90
    2nd, 90 + 9 = 99
    add 1, 99 + 1 = 100

    Wouldn’t that give you 11-100?

    The Lowest number on a dice is 1, and 1×10 gives you 10.

    The formula would have to be ((d10-1)×10)+d10=x≥90⟹y=y+1

    there’s a 0 on the die