Original Casio calculator fx-991EX works great. Seller assumes all responsibility for this listing. Shipping and handling. This item will ship to United States, but the seller has not specified shipping options. Contact the seller- opens in a new window or tab and request a shipping method to your location. Comparison of Casio FX-991EX and Casio FX-991MS based on specifications, reviews and ratings.

Many times the tool we use will affect the result and the good one will not only give a better result but experience as well. One of the most common tools required by students is a calculator and those who will be taking higher-level math class will need something like Casio FX 115ES Plus Vs FX 991EX. These scientific calculators are very reliable but also slightly different in capabilities so before making a decision, go check what they can offer below first.

In this article, we are going to give you information about:

Which Calculator to Purchase
What Scientific Calculator is Used For
What are Casio FX 115ES Plus and FX 991EX
What Casio FX 115ES Plus and FX 991EX Look Like
How are the Menu and Layout of Casio FX 115ES Plus and FX 991EX
How to use Casio FX 115ES Plus and FX 991EX
What are the Functions in Casio FX 115ES Plus and FX 991EX
Casio FX 115ES Plus Vs FX 991EX

Calculator Types

Computers and smartphones may be everything today but in some applications, you will not be allowed to use them, such as in a learning process. The one we can still utilize in such conditions and many other activities is calculator but not all calculators will be useful in your classes because different subjects and focus will need different tools as well to assist the lesson. In general there are basic calculators, business or finance calculators, and scientific calculators which are usually the most expensive and most complicated to use.

Basic calculator will only have a common function that we are using everyday in many cases such as add, subtract, multiply, divide, percent, positive/negative function and in some models square root. It is easy to use and in fact most of us will be instantly familiar with how they work without much confusion. Business calculator or also commonly called a financial calculator is the one we use to deal with money related problems; here you can count the value of money or payment.

Many of them such as HP 12C Vs 10bII are mostly used by professionals or students taking accounting courses while the calculator itself can be either using RPN or algebraic system depending on the model. The last and probably more advanced is scientific calculator and as the name suggests, this is the one used when you are studying science, engineering or dealing with math problems due to their collection of functions such as exponents, log, LN, trig functions, and memory that are useful in the application.

Using Scientific Calculator

Using a scientific calculator is not an instant process because for a beginner, we have to learn on how the tool operates first that you can check out in their manual since different models vary slightly as well. After understanding how to enter, clear history, and changing their button functions or how to adjust the mode if available, now we can use the tool to solve various problems especially trigonometry that uses sine, cosine, tangent, inverses, and even their hyperbolic functions.

For those dealing with trigonometric values, we can change the calculation between degrees, radians, and grads while now we are also able to access pi and Euler’s constant, e. In addition we can find buttons with function to calculate exponents to the second, third, or any other power. If you are working with scientific numbers, there is this Exp button that will let you input scientific numbers while engineering problems usually use exponents, logs, and scientific numbers. All of them will require steps to calculate but with a calculator, what we need to do is only entering the correct input.

About Casio FX 115ES Plus and FX 991EX

If you are here then it means you will need a scientific calculator and with almost endless options out there, the shopping may not be going to be a short trip especially for those who want to get the best option out of their budget. Any scientific calculator will be able to work with scientific problems but we prefer those from well-known manufacturers just because they have better build quality and it is easier to find a solution in case we will be facing certain issues with the product later.

Both local and overseas companies have various leading models and the more people using the calculator, the easier to find a solution or learning materials. One of the best options when it comes to scientific calculators is the Japanese brand Casio because they are very good not only in quality but also the product reliability and performance. The price point itself is very much the same as similar models from other brands like TI or HP so students and parents don’t have to spend much to get the ideal calculator.

They sure have various scientific calculators but some stand out more than the rest and they are Casio FX 115ES Plus and FX 991EX. These models are the favorite of many users not without a reason because first, they are powerful and will deal with all basic needs that you will be using in such a tool but second, also reliable and easy to understand. What can get confusing is that they are also very similar to each other, making it hard to decide which model we should go after.

In comparison the FX 115ES is an older scientific calculator from Casio as this model has been around since 2011 and continues being one of the bestselling models even among others from different companies. In 2016, they launched a new calculator and this is the FX 991EX which is more like the upgrade version of its older brother so for those who have been using the former calculator will get everything in this one too yet with some improvement to make it even more reliable.

Casio FX 115ES Plus and FX 991EX Design and Display

Putting the Casio FX 115ES Plus and FX 991EX side by side you can instantly tell what has been improved in the newer model and we can say that this one indeed has a better screen quality, the display looks crisp and overall easy to look at but, what makes you still considering the former model is actually the number/font size because it is bigger in 115ES thus, some users especially those wearing glasses may prefer the older calculator.

In addition, somehow the new model has a reflective display, it bounces back light and can be quite annoying to work with at night with a table lamp near or above it. The build quality seems the same, the 991EX is lighter and may feel slightly flimsy on some hands including those who will be using the tool in the field. However, the keys or buttons are very similar, they are not the best but big enough to press quickly, responsive, but not too loud.

Casio Fx 991ex Combination

Casio FX 115ES Plus and FX 991EX Menu and Layout

The first thing we want to mention about the differences between these similar calculators is their menu because if you are familiar with the 115ES Plus, pressing the menu will send you to a list of options while the 991EX has a set of icons to select. Selecting the option is also a bit different as you will need to press the corre