Is RPN still relevant?

[Brian D]

(10-06-2015 05:05 AM)JimP Wrote:  this monstrous "common core" analysis of how to subtract one number from another

Although to be honest there is some merit to the idea that 57-23 is ((57-20)-3), which can be a helpful way to think about things for two- or maybe three-digit numbers. They seem to take this too far, though.