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The accuracy of order of magnitude estimations comes from the balance of under estimates and over estimates.  Work through a few Fermi questions and purposely skew some of your responses.  Does this affect your final estimation?

The University of Maryland maintains a site dedicated to Fermi Problems.  You can see them here: http://www.physics.umd.edu/perg/fermi/fermi.htm

Another example of a Fermi-like-problem is the Drake Equation.  It tries to estimate the number of intelligent life in the universe.  See a TED-Ed lesson about it here: http://ed.ted.com/lessons/calculating-the-odds-of-intelligent-alien-life

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