OA-991EX PLUS Scientific Calculator 552 Functions Support Fraction and Decimal Point Conversion 2-Line Written Display Solar Battery - Ideal for Middle High School Students and Teachers Black

This calculator is an essential tool for A-level students, offering a wide range of advanced functions which only my daughter knows. It has a clear, easy-to-read display and intuitive buttons, making complex calculations straightforward.While it’s packed with features, it may take a bit of time to fully understand all the functions. However, once you're familiar with it, it's reliable and accurate for both exams and study sessions. Happy with the purchase.

The media could not be loaded. The person in the video is a mathematical nincompoop so he's just tapping away at random buttons.It was given to someone in high school who understands complex maths. The general impression is that this is a good mathematical calculator. So far he has not uncovered anything that it doesn't do that he would expect to do.It feels a little plastic but it is a plastic calculator so that shouldn't be surprising. It might not be the most robust and tank-like calculator you can buy but I doubt you're going to be taking this into a hostile environment.

I haven't had a 'proper' new calculator for many many years. When I got my first job as a programmer, my parents bought me a solar powered scientific calculator, which I still have more than 40 years later. When I saw this, I just had to get it. Brings back a lot of memories and harks back to the good old days of computer programming when having a good quality calculator was an essential tool.This is a very nice calculator. It comes with a hard plastic half-case, into which is slides for protection, and can then be slid in backwards for use. Personally, I'd have preferred a fold-over flap-type soft case, as the unit has a tendency to get 'stuck' in the hard shell, requiring some force to push it out. The calculator itself is extremely lightweight, so much so that it actually makes it feel a bit cheap. If the manufacturer had added some weight it would have gone a long way to making it feel higher quality. The only issue I really have is that I wish it had a backlight. Perhaps this would require a larger battery, but again that would increase the weight and make it feel a bit more solid, so could be an improvement. I found the display quite difficult to read in low light conditions, even when adjusting the screen contrast.Overall, it's a full function calculator that provides for pretty much every basic mathematical option one might need, but it feels very light and definitely needs a backlight.

The media could not be loaded. A good Scientific calculator, it is handy to have the solar powered and battery function, it calculator works well even when in a room without daylight.The screen is easy to read and it is easy to operate with no glitching.I got this for my son who is currently studying for his Nat 5 maths, he reports that it does everything he need and that it does some other stuff too, but he has not learnt about that yet!

The calculator works fine, but it's obviously a 'homage' to the Casio 991EX.If you are struggling to pay the extra few quid for the Casio, then fine, but I do not see why you wouldn't just buy the real Casio.The only other negative is the texture on the plastic, which can make the print hard to see, especially in some lighting.I'd put in the extra fiver and buy the real thing, but it does do the job if you really must.

The DUPOTA OA-991EX PLUS Scientific Calculator is a versatile tool, offering 552 functions that cater to a broad range of mathematical needs. It's especially suitable for A-level students and professionals alike, with capabilities spanning fractions, exponents, matrix calculations, and statistics. The dual-line display is particularly helpful, allowing users to see both inputs and outputs simultaneously. Although it may take some time to fully grasp all its functions, once familiar, it proves to be a reliable and accurate companion for both study sessions and exams.One of the standout features of this calculator is its dual power source, utilising both solar and a button battery (LR44) for backup. This ensures that it remains operational even in less than ideal lighting conditions. However, some users have noted that the lightweight design, while making it highly portable, gives it a somewhat cheap feel. Additionally, the slide-on hard plastic case, although protective, can be a bit cumbersome to use, often requiring some force to remove.Despite a few minor drawbacks, such as the lack of a backlight and the default fraction mode, the DUPOTA OA-991EX PLUS remains a solid choice for those needing a comprehensive scientific calculator. Its ease of use, once mastered, and its vast array of functions offer good value for the price, making it a dependable tool for both students and professionals.

If you press SHIFT then FUNCTION you will see a menu. Select "1. Input/Output" by pressing "1" and then select "2. Math I/Decimal O". This tells the calculator to accept Mathematical symbols as Input and to Output the answer in decimal. Now if you enter "123 x 5 ÷ 7 =" then you will get the answer in decimal: "87.85714286". Alternatively, you can just press the "CHG" button!It's a very powerful calculator, so you need to read the manual. The bit about input/output options is on page 4, under the title "Using Menus".TIP: I can't find a PDF version of the User's Guide for the DUPOTA OA-991EX Plus. However, the CASIO fx-991EX User's Guide is almost identical and easier to find. Just bear in mind that when following the instructions in the CASIO Guide then the "OPTN" key is named "MISC", and the "S⇔D" key is named "CHG" on the DUPOTA.