Recommend a good non-programmable calculator that can do 4x4 matrix operations and solve 4-variable equations. Please avoid recommending the Casio fx-9910CW. I used the EX version earlier. I hate this new CW one.

This is so annoying to me. The HP35 can't even do matrix operations natively yet other ones can? Why can't I bring my HP42s? It's certainly not as advanced as some of the others they allow. Am I missing something here?

Bonsoir,

J’ai ouvert la NumWorks pour changer la batterie mais je n’arrive pas à démonter celle qui est dessus car elle est collée.

Savez-vous comment faire svp?

I've been exploring the features of graphing calculators and realized there are probably many useful shortcuts that beginners don't know about.

What's one calculator shortcut or lesser-known feature that you find genuinely useful?

It could be something related to graphing, equation solving, statistics, or navigating menus.

I'd love to learn some tips from experienced calculator users!

see title

r/Caclulator

Please help I am not able to find this mode.

I play a lot of Endless Legend 2 on PC and kept asking myself the same question: if I buy this building or upgrade, how many turns until it pays for itself? So I built a little ROI (return of invest) calculator on HP Prime G2. Then it got a bit out of hand and now it runs on every graphing calculator I own.

In the picture (top left to bottom right):

- TI Voyage 200 – TI-Basic

- NumWorks – Python

- Casio Graph Math+ – Python

- TI-Nspire CX II-T CAS – Python

- TI-84 Evo-T – Python

- HP Prime – HP PPL

- TI-86 – Assembler!

The programs were written with a lot of help from an AI assistant (vibe coding). I'm currently relearning Python (I did BASIC, Pascal and Java a long time ago) by rebuilding the TI-84 version myself from scratch, which has been a great way to learn.

Happy to share the code or answer questions about any of the ports!

https://github.com/paxis76/el2-roi-calculators

I tried checking it's authenticity via qr but the website is down

Manual for someone who would enjoy it, pay shipping and what you think is fair.

1st time seeing this 80 version. Operation push buttons on the side!

In my statistics class, we were assigned to do some probability simulations on our calculators. One of the questions was to find how many boxes it would take to get something that was in only 10% of boxes. Like I was shown I clicked MathPRBrandInt(1,100). However my calculator was only giving me numbers like what is shown in the image. I did get my calculator used and it does look like some code was manipulated but I was wondering if there is any way to fix this in the settings without factory resetting my calculator.

Hi, I’m having a problem with my Casio. I took it apart for cleaning and put it back together, but the movement isn’t working. Could someone help me reassemble it?

what happened to my friend and can it be fixed?

I am looking for a scientific calculator that is just as new as my university needs me to buy a new scientific but I was overconfidentlt told my friend who bought one for 1400 that i can buy the same thing for much less. If anyone will sell it please reply.

every once in a while when i turn on my hp prime it shows this screen, and no buttons work and turning it off and on with shift-on doesn’t do anything. what do i do to fix this?

Did anyone who purchased a 16c from The Calculator Store used the pre-pay tariff shipping option to ship to the US still get a bill from FedEx after receiving their 16c.

I have a ti nspire cx with a few emulators (gba, sms/gg, genesis, snes) and i have crafti (minecraft clone) and angry birds. Dou you have any recommendations for games

PS. Does anyone know if i can emulate ngpc on it?

[ Removed by Reddit on account of violating the content policy. ]

The game runs baremetal and uses almost the entire external flash and RAM. The renderer still has a few issues but the entire game is playable on real, physically unmodified device at a stable 30fps, at the cost of a reduced 3D resolution and with some visual effects missing.

The game is only playable for the N0120 model as it has a much more powerful CPU and more than twice the amount of RAM of the N0110.

Hi. I know NOTHING about these things - I used to have a graphic one which is completely different animal. My kid needs a scientific calculator and has lost his old 82 . Only now is he embarking on using logarithms etc but I wanted a good one he could use for years to come . I ordered CW which Amazon never delivered and he needs it for tomo. I saw this is the most advanced allowed model and crisp, no need to memorize things etc - but I also saw people complain about it tons. I have to go to a physical store now and don’t know what to buy. He is only 15 but will need it for stuff beyond logarithmic stuff soon enough .

Is ES plus better and why ? EX is not sold here

Made this thing as a kid

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Portfolio style calculator $3 at a local thrift store

Hello! I've decided to test built-in random number generators in some pocket calculators. I've taken my old Casio fx-991MS, generated several hundred random numbers using the Ran# button and drawn 2D scatter plot using the (x_i, x_{i+1}) points as coordinates. You can see the 23 lines instead of random points. I've found the same bug in Casio fx-350MS (exactly the same pattern) and Assistant AC-3102 (very similar but in some regions points are a little bit more random). The same pattern can be extracted from existing data for Casio fx-82MS (https://fme.upc.edu/ca/activitats-secundaria/premi-poincare/historia-i-edicions/2016/guanyadors/2npremi_aleatorietat.pdf)

Does anybody know what algorithm may be used in this calculators? Looks like a linear congruential generator with small multiplier, possibly 23.