Honestly, I count using the four fingers for 1-4, close the fingers and extend thumb for five, then extend each finger again for 6-9.
The right hand counts tens and works the same way. Can count to 100, and it’s pretty intuitive. It’s like if positional notation was discovered way earlier.
coworker taught me this and it blew my mind. I had previously jokingly used base 2 with my hands, but something like 01001 10010 would be difficult to handle.
Fun fact: when learning some instruments (e.g. bowed instruments) you also number the fingers starting from your index (because you don’t play with the thumb)
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