It's a shame it has a screen that looks like it came from the turn of the century.

Calculators are not exactly premium devices, even though you'd likely think otherwise when you have to buy the anointed model for your kids' school.

That said, Casio is probably churning these things out with a BOM around $5-$10, so you can't really expect much from the display. We're spoiled by our phones, which (weirdly enough) have no single, definitive "good" calculator on either iOS or Android (and can't be used in class anyway).

When your device has an app store or allows third party software in some other way it will never have a "single definitive good app" for anything, there will be many bad ones and a maybe a couple of good ones, for math there's this good one: https://github.com/mkulesh/microMathematics