TITLE: Advocating base 12 number system
QUESTION [10 upvotes]: I had a calculus professor who suggested we should be using base 12 number system. What are the advantages of using such a system?

REPLY [5 votes]: Well, in the base $10$ number system it is as easy to multiply by 5 as to divide by 2 (the answers differ by 0 at the end). And it is as easy to multiply by 2, 4, 8... as to divide by 5, 25, 125..., by the same reason. So in the base $12$ number system it is as hard to divide by 2,3,4,6,12,4,9,16... as to multiply by 6,4,3,2,1,36,16,9..., and, therefore, one can trade division to multiplication in more instances...