Numerous civilizations, such as the Sumerians and Egyptians, did use base-12 math. We find the remnants of this in our timekeeping systems - 12 hours of day and

Numerous civilizations, such as the Sumerians and Egyptians, did use base-12 math. We find the remnants of this in our timekeeping systems - 12 hours of day and night, 12 months in a year, 60 minutes per hour and 60 seconds per minute, etc. Human mathematical prowess is in no way limited by the number of fingers on a human hand.