Casio FX-115ES Scientific Calculator

This calculator is an evolution of the fx-115 ms. Problem solving is organic because the representation of the math is the way you do it everyday.Is the best calculator in this price range so do not waste your time buying other.

This calculator is absolutely the best calculator that I have ever owned or touched in my life. It displays answers as they are, whether it is a square root, or a fraction, or decimal, or angle. Not like a big obnoxious number like the other calculators show.

This is an excellent calculator, many options, lot of functions, and so on... I like the way it shows me the operations. the same way I write it on my notebook.

This is the most powerful scientific calculator I've ever used. In addition to it's ability to display expressions as they would be written on paper, it features the ability to perform vector operations in 2 and 3 space (cross & dot products, addition, subtraction) as well as matrix operations. It has the usual array of abilities such as solving quadratic and cubic equations of one variable and linear equations of up to 3 variables, evaluating integrals and derivatives, and a bank of useful scientific constants and conversion factors. I heartily recommend this calculator to any senior high school or university students. It will do everything you need in a handheld calculator.

Love this calculator. Originally purchased a TI-30XS Multi View which is a nice calc. also, but the Casio is far and away a better unit for the cost and the features it has. The Casio for instance has a small battery compartment in the back which facilitates easy removal/replacement of the single LR44 cell. The TI unit needs to be disassembled with a tiny phillips screwdriver and the entire back must be removed. Granted, the batteries last many, many moons, but still it should have been designed more user-convenient. Also the display on the Casio if far superior to that of the competition, very readable with no eye strain at all.

Just get one of the 115ES's and you won't be disappointed, I promise you.

I am an engineering graduate student. This little calculator pretty much does everything that I would need to, other than plotting graphs. It has all the constants and metric conversions. Can integrate and differentiate. The display is kinda cool too. Only sad thing is that I am more of a decimal person than a fraction person, the calculator gives its answers in fractions, which is not a big problem as the decimal is one button press away, but still... you know...

highly recommended, and at its price, everyone should have one of these

the calculator is very simple and do not need a skill to deal with. I need it since I am a PhD in Electrical and Computer fields, we have many mathematic problems that may not easily solved without the use of calculator. I prefer Casio among other brands since I use Casio for a long time. Unfortunately, my Casio was stoled that why I decided to buy another one with the same type.

great, I like the calculator and the service~!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

This calculator is cheap, and still has a lot of features. I have a TI-89 Titanium and I now use this for a lot of things. It's ability to do unit conversions is very easy and comes in handy. Worth every dime!

What i like about this calculator is that it has some cool features like integration, differentiation, summation. so you can easily check whether your answer is right in an exam. Also, you do not need to put characters into parenthesis while dividing, adding, subtracting or multiplying, the software calculate base on the principle of "BODMAS." Although substantial amount of time is needed to get familiar with the features,it is a good gadget for any math problem you might encounter, highly efficient and accurate.I guranttee you will always be glad you bought it.

I did not received the item I have purchase from this vendor. I sent a request to send the item to my new address which is 2910 Buford Drive Apt.1620 in Buford, Ga 30519, still I have not received a response to my request. I understand that paypal used to have my old address but I gave them my new address to both paypal and the vendor so my calculator can be sent to my new address. No RESPONSE Yet. Therefore I see that I cannot trust this vendor.

The product was just like the seller stated. When it came, it was in the original package and brand new as described. I couldn't ask for a better deal. Love it.

This specific model is worth every dime!! Casio at its best! with great display and functions and easy to operate, this calculator beats any other brand hands down!!

Great Service, Great and Fast Shipping and Thank you for the Deal.

Hector Xavier Diaz Santiago

IMO Casio scientific calculators are much better than the TI ones.
Casio fx-115 is much easier to operate and shows your calculations in a textbook style. i bought a $ 15 Ti and a $ 15 casio and the difference between the two is remarkable.
for one the TI only has one mode which is standard mode while the casio has 8 different modes ranging from equations to statistics and vectors.
the TI performs basic calculations while the casio can integrate and deal with complex numbers.
all in all the casio is a very well built calculator and i have used it all through high school and am still using it in college. Recommended

This is one of the best options for calculator
If you do not need a reward, is the
most powerful non-rewarding to know, many functions, in this calculator are all advantages.

I have actually used this kind of calculator before but I lost it so I had to buy a new one. This calculator does everything save graphing. I have used it for 3 years now, and I'm a Calculus II student. The only complaint I have with this device is that it does need some time to get used to. You need to figure out how to change modes and everything, but that's what the manual is for (NEVER BUY WITHOUT THE MANUAL). Other than that, this is one of the most efficient calculators I have ever used, and very reliable.

It requires more operations than most calculators to calculate basic math calculations. But definitely, it has more fire power in its arsenal but at the expense of more complicated steps.

Casio is a a great calculator and here I recieved such a great price. The calculators cam very prompt, I was suprised. I am very satisfied with both the product and the service.

I brought this calculator for my wife and it is a nice work with this price. The seller wrapped it nicely and carefully.

The Casio FX-115ES is sold in Asia as the Casio FX-991ES. It's the same calculator, except for the model number. The power supply is a solar panel supplemented by a single LR44 battery.

In evaluating calculators of this type, I tested the Casio FX-115ES alongside the Casio FX-65, the Sharp EL-506WBBK, the Sharp EL-W535B, and the TI-80X. Although the Sharps were about as featured as the FX-115ES, the FX-115ES outperformed them in tests of computational accuracy such as evaluating the tangent of 355/226, the sine of 1E8, and the 3/5 power of -32.

All the usual scientific calculator functions are present, plus a few that you don't often see, such as log to any base, absolute magnitude, mixed and improper fractions with conversion to decimal, Riemann sums, numerical integration and differentiation. The Casio FX-115ES uses Gauss-Kronrod quadrature for integrals, instead of the usual Simpson's rule, which seems to give better results for some integrands.

The log-to-any-base feature includes the possibility of making the base of the logarithm, itself, a function of the independent variable.

The Casio FX-115ES will hold equations for multiple calculations of Y for different values of X, so that points (X,Y) can be generated quickly by repeatedly pressing the CALC button and entering X when prompted. The equals sign (=) used with functions is in the upper left corner of the calculator panel as ALPHA CALC.

It will also SOLVE functions in reverse. For example, given the function Y=X-Asin(X) with the calculator in radian angle mode, pressing 2nd SOLVE will prompt you to input Y and A, after which the calculator would solve for X. If Y=4 and A=0.8, then X=3.626850697. Note that solving a transcendental function for the value of the transcendental variable is not a problem for the Casio FX-115ES.

The CALC and SOLVE features give calculators having them a tremendous advantage in ease of use over calculators that don't have them. Entered functions, integrals, and derivatives can be edited by using the directional button (the big circular one) and the DEL key.

The Casio FX-115ES provides 40 physical constants as well as 40 units conversions. It will also convert from decimal degrees (or decimal hours) to DD.MMSS format and the reverse.

The statistics mode offers seven two-variable regression models (linear, quadratic, logarithmic, e exponential, ab exponential, power, and inverse), plus the usual single variable statistics function is also available.

The vector & complex calculations can be swapped between rectangular and polar coordinates. The available alternate bases, besides decimal, are hexidecimal, binary, and octal. The math capabilities of the fx-115ES are truncated in any of the bases other than decimal.

The Casio FX-115ES isn't perfect. It's just the best there is at present. Room for improvement certainly exists. First, there is no good reason why a calculator can't use any base > 1 directly with any of its functions. Nor is there any reason why alternate base results can't be displayed in fractional or post-dot digital form.

Second, the matrix operations are restricted to a maximum size of 3x3 matrices. Students who apply the theory of relativity need at least 4x4 matrix operations. And bigger, of course, would be better.

Third. The factorial key should be supplemented by a gamma function.

If you need more calculator than the Casio FX-115ES, you probably should buy a TI-89 Titanium. More than that requires a desktop computer.

EXCELENTE TODO MUY BIEN LA CALCULADORA FUNCIONA A LAS MIL MARAVILLAS, SE ADAPTA A TODAS MIS NECESIDADES, EL ENVIO FUE RAPIDO Y SIN PROBLEMAS, TODO BIEN ESTOY FASCINANDO CON LA CALCULADORA...GRACIAS..

I liked it to communicate with the seller, a part of product quality. Despite being so far away, I made the purchase from Spain, all facilities have been and explanations. Back to buy if I have chance.
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Hi use to use Ti-89 but that calculator was not allowed in FE examination so i switch to Casio FX-115ES Scientific Calculator. This calculator does not have as many function as Ti-89 but its better than most of the scientific calculator out there these days. I would suggests if you need to take FE buy this it has all the functions you need.