Street-Fighting Mathematics: The Art of Educated Guessing and Opportunistic Problem Solving (MIT Press)
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I also like this guide: https://www.amazon.com/Street-Fighting-Mathematics-Educated-... , https://www.amazon.com/Art-Insight-Science-Engineering-Compl... , https://www.amazon.com/How-Measure-Anything-Intangibles-Busi...), then you'll be able to perceive the mindset that has significant transfer to many problems that have even just approximate answers.
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