Street-Fighting Mathematics
Follow that up with his slightly more advanced <i>The Art of Insight in Science and Engineering</i> [0].<p>I feel like these two books plus Art Benjamin's <i>Secrets of Mental Math</i> [1] would put your Fermi calculation abilities on another level.<p>[0] <a href="https://mitpress.mit.edu/books/art-insight-science-and-engineering" rel="nofollow">https://mitpress.mit.edu/books/art-insight-science-and-engin...</a>