On Being Approximate 

What is being approximate?
Why be approximate?
It gives you more tools, and generally makes things easier.
How do you do it?
How to simplify a number
(Rounding  Order of magnitude  Exponential Notation  Memorable numbers )
Working with uncertainty
( Bounding  Honesty)
The power of approximation
(
"What order of magnitude is ..." game
 Easy math with exponential notation
and orders of magnitude
 Fermi Questions
 Developing "deep" understanding
)
Comments encouraged.  Mitchell N Charity <mcharity@lcs.mit.edu> 