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)
  • 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