3 ms·
A system I read about uses the thumb for 5, so that each hand can count (thumb down) 0..4 (thumb up) 5..9. This gives you the range 0..99. Sweeet.
by euroderf 1y ago
A system I read about uses the thumb for 5, so that each hand can count (thumb down) 0..4 (thumb up) 5..9.
This gives you the range 0..99. Sweeet.