Product ReviewsCasio FX-991ES Plus Scientific Calculator

Easy to Use

I bought this calculator because it was the best allowed for use on my exams (best in terms of its features and capablities). The "pretty print" font feature is great too. It can even perform integration and differentiation of a function at a specific value of the independent variable (or over a specified nonvariable range. Unfortunately, it can't produce the function that is the derivative, etc. of a given function like the TI89 (but then if it could it probably wouldn't be allowed on your exam anyhow). Anyway, this thing is pretty decent for calculus and physics - for stats, use a TI83 instead if you can. It is more than adaquate for business types and decent for science students too assuming your professor is against more advanced models. Engineers already know they'll be needing a bit more power. Hope this helps you make an informed purchase decision.Read full review...

Equation Solver

I bought the Casio FX-991 ES. Fantastic for using Newton's law of approximation to solve equations like sinδ = a + bcos(δ + β) (a, b, β constants). Just substitute the ANS key for δ in the equation and keep hitting the "=" button till the answer doesn't change (converges).Read full review...

Verified purchase:  Yes | Condition: new | Sold by: discountwatch-llc

Best Simple Display Calculator I've Used

Best non graphing calculator for engineering courses I've used. Best part is being able to plug in human readable fractions.

Verified purchase:  Yes | Condition: new | Sold by: ahmed1164

Precise with great features

I'm a student and this calculator helps me a lot to accomplish the math exercises required by class. Many functions are included, more than I will need actually but I loved the design, the big screen, the price and the ease of use.Read full review...

Verified purchase:  Yes | Condition: new | Sold by: ahmed1164

Great for Digital Systems Design

I recommend this model for CS studies and Electrical Engineering. It's real easy to calculate in non decimal base: base 2 8 and 16 and to convert it back to decimal.

I think there are calculator models with a more robust screen. I guess that's why it's relatively cheapRead full review...

Verified purchase:  Yes | Condition: new | Sold by: easystreet_hangout

Silver star

Having the same type of calculator for last 15 years. This one is something like third generation, in my case

Verified purchase:  Yes | Condition: new | Sold by: krazydeals2010

Outstanding value for money

It is probably the best scientific calculator in its category (scientific without graphing or Cas capabilities).
It is able to do pretty much everything a student or an engineer needs (complex numbers,polynomials,3x3 vectors and systems,definite integrals,trigonometry and simple variable calculations) with very easy to use interface and no overcomplicated combinations.Read full review...

Verified purchase:  Yes | Condition: new | Sold by: krazydeals2010

Buy this!

I had gotten the same kind for my older kiddo so felt comfortable getting it for the younger. They both love them and use them constantly In school. Excellent quality and price!

Verified purchase:  Yes | Condition: new | Sold by: bondra

buy it won't regret it

Lots of useful fonctions old model we can't find anymore, newer are hopless/helpless ... Thanks i could find this one ... bless recommended

Verified purchase:  Yes | Condition: new | Sold by: spiceshub39

Great math assistant

Great calculator with many features extremely useful in math. Would recommend to everyone!

Verified purchase:  Yes | Condition: new | Sold by: ahmed1164