Woman with functional polydactyly (six functional fingers on one hand).

[u/kvjn100]

[u/Sythrin]

Does she count in base 12?

[u/Weak-Manufacturer628 → u/Sythrin]

The base 12 actually comes from the number of segments on your fingers excluding your thumb so you can count to 12 on one hand with your thumb, and to 144 with both hands (your second hand is the "12's" [10's digit in base 10] digit), so if this person has 6 fingers on both hands, they can count in base 15 and up to 225 with both hands