add to solving problems section:

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Estimating (using estimation to check if solutions are in the expected range)
Unit Analysis (tracking units to check work, build new equations, see connections)
Graphing Trends (using graphs to answer questions like what happens to the acceleration if the mass is zero?)

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Fermi problems for estimation
https://www.physics.umd.edu/perg/fermi/fermi.htm
http://www.physicscentral.com/explore/poster-cheeseburger.cfm