When HN users recommended it
3 HN users recommended this between 2020 and 2026, in 5 comments.
20072026
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
3 HN users recommended this between 2020 and 2026, in 5 comments.
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
I'm liking the Casio FX-115ES PLUS rev 2 ($14.50), because it simplifies rationals and has LCM, GCD and factorization. For example, when you enter sin(60), it gives sqrt(3)/2, enter 1/(1+sqrt(3)) gives (sqrt(3)-1)/2 or enter sqrt(120) gives 2*sqrt(30).
https://www.amazon.com/Casio-fx-115ESPLS2-Advanced-Scientifi...
This is helpful for my kid's math class.
You wouldn't buy a textbook from Texas would you? So why buy a calculator from there when there is an option from Tokyo? :-)
Well Casios are better than TI calculators.
My current favorite calculator is Casio ES-115 PLUS2
https://www.amazon.com/Casio-fx-115ESPLS2-Advanced-Scientifi...
I like it because when you enter sin(pi/12) you get (sqrt(3)-1)/(2*sqrt(2)) in mathematical notation, which is really nice for a $16 calculator.
Here I'm going to hurt TI: If you need a TI-84 or TI-89 for school, the place to get them cheap is shopgoodwill.com:
https://www.shopgoodwill.com/Listings?st=ti-84%20plus&sg=&c=...
Cleaned url: https://www.amazon.com/Casio-fx-115ESPLS2-Advanced-Scientifi...
Thank you so much for pointing out fx-115ES PLUS2! I looked for a good hour yesterday trying to find an alternative to the fx-115ES PLUS (first edition) with the same features, after Casio discontinued the original. I'm honestly embarrassed that I had overlooked this...
I do absolutely agree that Casio calculators are just wholly better than TI in general. Their menu driven interface is a game changer for me back in middle school. TI-36X Pro felt cumbersome and confusing, while fx-115ES was much more intuitive.
Desmos? https://www.desmos.com/
Or a $16 Casio fx-115ES plus? https://www.amazon.com/Casio-fx-115ESPLS2-Advanced-Scientifi...
My favorite cheap Casio is fx-115ES Plus 2nd Edition, $17
https://www.amazon.com/Casio-fx-115ESPLS2-Advanced-Scientifi...
Includes GCD and LCM, some of the newer ones don't have them.
If you want graphing, there is the newish fx-CG100 has a nice display, but they removed Casio basic, it now only has micro Python (way too awkward to type on a tiny keypad):
https://www.amazon.com/Casio-ClassWiz%C2%AE-Calculator-Funct...
The older ones that still have basic:
https://www.amazon.com/Casio-fx-9750GIII-Graphing-Calculator...
BTW, here is a review I made of many calculators, measuring keyboard efficiency: (HP-15c still the best)
https://github.com/jhallen/calculator/wiki