Casiofx-991ES Plus C 2nd Edition Calculator

The Casio fx-991ES is a huge bang for the buck. It's an advanced scientific calculator, which means that in addition to the usual basic scientific operations like trig, logs and exponentials, statistics, and probabilities, it also supports complex arithmetic, vectors and matrices, and numeric differentiation and integration. It's everything that the expensive non-CAS graphing calculators (I'm talking about you, TI-84 Plus CE) can do, minus the graphing and the programmability, but at about 1/8th of the cost!The fx-991 series has the added advantage of being one of the very few calculators that are allowed on the fundamentals of engineering exams, and of those permitted, it's the most powerful. Casio has an odd naming scheme for its models that play against it. The Casio fx-115 series and the fx-570 series are functionally the same calculator, but not all institutions will know this. For example, the NCEES exam board allows the fx-991 and the fx-115, but not the identical fx-570, simply because they justifiably can't be expected to track Casio's "creative" naming schemes. But the 991 is very well known everywhere, so it's a safe investment.Aside from being an excellent calculator, it's also esthetically pleasing, well designed, light, and compact. The 991ES has a fraternal twin, the 991MS that has a distinguishing difference. The ES has Natural V.P.A.M., which is a fancy way of saying that it tries to display equations as closely as possible as they would be written on paper, while the MS uses a less pretty form. But there's another more important difference: the ES will return the exact value of some results, while the MS will not. For example, the ES will return sqrt(2)/2 for sin(pi/4), which you can switch back and forth with its numeric approximation, but the MS will return only the numeric approximation of around 0.7071.If you're in the process of choosing a non-graphing, non-programmable, advanced scientific calculator, the closest competitors (excluding the identical other Casio models) are the Sharp EL-516 and the TI-36X Pro. You can't go wrong with any of these, and they're nearly equivalent in every respect, so your choice might boil down to personal preference, brand affiliation, or what your learning institution requires. I took the lazy way out and bought all three. My personal favourite of the three is the 991ES, but the Sharp is prettier (but bigger).Also, if you don't need the advanced functions (complex, vectors, matrices, calculus), the Casio fx-300ES is practically identical, but without those advanced functions; just the basic scientific ones (trig, etc.). And it's almost half the price.

That's right, you can ace your exams with this reliable calculator. I've been using it since its Silver and Blue coloured model but this one had a much better design overall. I could see the buttons won't get worn in as much as the older version so I started recommending it to my friends and freshman students as well.

I’ve been using the Casio FX-991ESPLUS2 for my college courses, and it has been incredibly convenient and reliable. This calculator has all the functions I need for advanced math, including calculus, statistics, and engineering courses.Key Features: • Versatility: The calculator handles complex equations, matrices, and integrals with ease. It’s perfect for a wide range of subjects, from basic math to more advanced topics. • User-Friendly: The natural textbook display makes it easy to input and review equations as they appear in textbooks. This feature has been a game-changer for me in understanding and solving problems more efficiently. • Portability: It’s lightweight and easy to carry around, which is ideal for moving between classes and study sessions.Overall, the Casio FX-991ESPLUS2 has exceeded my expectations. It’s a must-have for any college student looking for a reliable and comprehensive calculator that can handle a wide range of mathematical tasks. Highly recommended!

I got this because it's a little like the calculator I had in high school which had the ability to work in mixed fractions and in hexagedimal, in polar vectors as well as integrals and was programmable. This one isn't programmable but is far more sophisticated in what it can do including matrices and certainly in it's display, but also is also far less intuitive. It comes with a protective slide on plastic cover that has a poorly thought out cheat sheet printed on it instead of the fake leather billfold my high school calculator had (to which I had glued a vi editor quick reference sheet) and unlike the thick well written book like manual of my high school calculators, this just had a poorly written folded pamphlet sheet. I guess we're really in the days of just using a smart phone app instead of a calculator given how poorly laid out the user interface of this calculator is compared to those of the early 80's. Turning off this calculator isn't intuitive at all. Wish I still had my high school calculators (one was a Casio, the other a Radio Shack but they were the exact same calculators, I also had a Sharp with a sophisticated dot matrix screen like this one but that one was far less capable than the others and obviously less capable than this one, again far more intuitive than this one). My University calculator was an HP 41CV, wish I still had that one as well, the app version sucks. The RPN of the HP calculators actually integrates with how you think of the equations but not with how equations are written but I also had to write more programs and purchase program module packs to make it useful.

by using the calc button!!!