I dunno, McGrath...it always seemed to me that counting by 10s was 'related' to the human body...at least *I* have the usual # of fingers.....and remembering 5280 ft and 1760? yards, etc. was always kinda tedious. And, being a woodworker, I have to deal with adding 1 17/32" to 3'4¾" and triple checking my answer.....metric does have its benefits...