Yeah if you have numerical methods intuition, 99% of the time you can get away with a guesstimation for practically anything. Most people are doing it wrong whe

Yeah if you have numerical methods intuition, 99% of the time you can get away with a guesstimation for practically anything. Most people are doing it wrong when they are trying to use calculators for complex computations directly. With a slide rule it's pretty obvious, as the precision is expensive on it. My grandfather, a mechanical engineer, taught me how to use slide rules and nomograms when I was a kid, but I still use calculators since they need fewer workaround tricks.