yeah, they could simplify math by just teaching useful stuff
   like ratios (cooking), how to measure stuff (1/4 inch, 1/2
   inch), percentages (credit cards and the lies they tell you when
   something is "on sale" in the stores - "what does buy one get
   one 1/2 off" REALLY mean) - ... and most importantly:

   Estimating. Most math in life is just estimating. REALLY ROUGH
   estimating.

   Like money: If you have $17, tell yourself you have $15.
   BUT the thing you're buying is $7. Tell yourself it costs $10.

   Round down what you have.
   Round up when you need.

   The truth is somewhere in there and if you get good at
   estimating quickly the right way, you always end up with a few
   extra dollars in your pocket.

   THAT'S real world math. Not... that... oldfashioned language on
   the speed sign. I hate that ancient math language.