Why do even the simplest calculators feature a square root key?

[Maximilian Hohmann]

(05-05-2018 11:50 PM)Mike (Stgt) Wrote:  Do they?

And what about this one here?



And regarding the original question my guess is that a lot of these simple calculators are used to calculate sales prices. Stuff which is either sold by area units (e.g. wallpaper or floor panels) or length and width needs to be converted one way or the other, for which a square root key can be useful.