If you do the math all the time it’s easy, but most don’t. You have one more plate in dozenal before you have to get fractional. And 6 and 3 aren’t weird numbe

If you do the math all the time it’s easy, but most don’t. You have one more plate in dozenal before you have to get fractional. And 6 and 3 aren’t weird numbers in dozenal. They’re like a half and quarter, respectively. 6+6=10.