@MostlyBlindGamer Use base-5: start with index, when you get to 5 put your thumb up and your other fingers down. Now thumb+index is 6, etc. You can count to 9 on one hand. If you use your other hand as 10s, you can count up to 99.
@dingodog19@MostlyBlindGamer if I'm gonna do something wonky like this I usually just treat my fingers as binary digits. that gets you to 31 on one hand, 1023 with both