How to Get Better at 'Back of the Envelope' Calculations

The art of estimations is pretty much a physicist's bread and butter. We all love a good estimation problem. You might also hear these called a "back of the envelope" calculation, or a calculation on a napkin. The writing medium is meant to emphasize how little preparation goes into attacking the problem. The estimator can't even take the time to find a clean sheet of paper.
Read more: https://www.wired.com/story/how-to-get-better-at-back-of-the-envelope-calculations/?source=Snapzu