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Casio fx-115ES PLUS Engineering/Scientific Calculator
64.20 SAR

Casio fx-115ES PLUS Engineering/Scientific Calculator

by  Casio, Office Supplies - 1 review

64.20 SAR 

+ 24.72 SAR Saudi Arabia Delivery
International Product from Amazon.com. Ships from and sold by Amazon Global Store US.
Color
Main Features:
  • Natural textbook display shows expressions and results exactly as they appear in the textbook
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PRODUCT INFORMATION

  •  

    Specifications

    Brand
    Casio
    UPC-A
    012303633199
    Item EAN
    2724659806094
    ASIN
    B007W7SGLO
    Color
    Color
    Black
    Weight & Dimensions
    DG
    DG
    DG
    DG
  •  

    Description:

    Casio FX-115ESPLUS Scientific Calculator

 

Customer Reviews

  • Purchased on Souq.com
    By user-2in1 on 09 October 2018

    it's amazing

    no thing

4.6
4.6 out of 5
1721 ratings
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Most helpful reviews on Amazon.com
  • A Test of the Speediness of Four Calculators with Numerical Integration
    By David Sims on 12 July 2018

    The four calculators are:

    1. The TI-36X Pro (scientific calculator)
    2. The Casio fx-115ES Plus (scientific calculator)
    3. The Casio fx-991EX ClassWiz (scientific calculator)
    4. The Casio fx-9750gii (graphing calculator)

    The problem used for test:

    B = 1.3271244e+20
    C = 6.957e+08
    D = 1.495978707e+11
    Evaluate:
    ∫ (C, 0.999999D) 1 / √(2B(1/x − 1/D)) dx

    This integral returns the amount of time, in seconds, for an object to fall to the sun's photosphere (one solar radius = C) starting from a distance of 1 astronomical unit (D), assuming that the sun and the object are initially at rest with respect to each other and are acted upon by no forces other than their mutual gravitational attraction. The variable B is the solar gravitational parameter.

    TI-36X Pro
    Answer: 5570898.581
    Time to Solve: 90.4 sec

    Casio fx-115ES Plus ← this calculator is being reviewed
    Answer: 5570898.583
    Time to Solve: 76.6 sec

    Casio fx-991EX ClassWiz
    Answer: 5570898.583
    Time to Solve: 17.3 sec

    Casio fx-9750gii
    Answer: 5570898.583
    Time to Solve: 4.9 sec

    As you can see, the Texas Instruments device is a slow-poke. The TI-36X Pro costs anywhere from $19 to $30 on Amazon.

    The Casio fx-991EX ClassWiz is the official (and substantial) Casio upgrade to the earlier Casio fx-115ES Plus. For moderately complicated numerical integration chores, the Casio fx-991EX is more than four times faster than its predecessor model. Furthermore, the Casio fx-991EX is more than five times faster than its ostensible competitor from Texas Instruments, the TI-36X Pro. The Casio fx-991EX sells at prices ranging from $14 to $36 on Amazon.

    But the Casio fx-9750gii is more than three times faster than the Casio fx-991EX ClassWiz and is about 18 times faster than the TI-36X Pro. Reasonable prices on Amazon go from $30 to $37, but there are some sellers (that should be ignored) who are trying to gouge for more.

    I have solved the indefinite integral analytically. Omitting the intermediate steps,

    ∫ 1 / √(2B(1/x − 1/D)) dx
    = √[D/(2B)] { √(XD−X²) + D arctan[√(D/X−1)] }

    When I used the calculators to solve the integral numerically, I had to avoid entering D itself for X, since that would cause an overflow error. When I use the upper limit of 0.999999D instead, the answer is 5577993.302993855, so all of the calculators' answers have relative errors of about −0.001272.

    104 people found this review helpful

    Published on Amazon.com

  • Highly recommend for Civil PE Surveying exam! DMS button will save you tons of time!
    By ExhibitGuy on 22 April 2017

    Absolutely wonderful calculator. I originally ordered this calculator as a backup to my TI-36x Pro for the California PE Survey exam, and ended up using this solely because of the degree/minute/second (°'") button. Instead of having to scroll to a menu to find the degree symbol, then minute symbol or second symbol, like in the TI-36x pro, it's all incorporated into that one button and it also converts to decimal degrees if you'd like. Here's an example:

    Convert 5°17'36" to decimals.

    On the TI-36x Pro: Enter 5 -> MATH -> DMS -> 1, 17 -> MATH -> DMS -> 2, 36 -> MATH -> DMS -> 3. Calculator spits out the answer = 5.29.

    On the Casio Fx-115 ES PLUS: 5 -> °'", 17 -> °'" , 36 -> °'", then press °'" one more time. Answer = 5.29.

    That °'" button saves so much time!

    Besides my rant about this little button, the calculator performs all the calculations very quickly, and is pretty fast at solving iterative formulas once you learn how to do it in the manual. The only caveat of this calculator are that it's a bit too lightweight. When you start punching the numbers quickly, the calculator starts sliding. I often have to hold the calculator in my hand to ensure I'm entering the numbers correctly. The buttons are also a bit flimsy but its more of an aesthetic than functional issue. Still, you can't go wrong with this calculator! Highly recommended.

    26 people found this review helpful

    Published on Amazon.com

  • Best calculator you'll ever own
    By Ayla on 03 November 2012

    I feel like Casio should be paying me for the amount of talking I do about this calculator. First off, I've owned the fx-115ES for about 2 years now and love it. I love it so much that I've not only recommended it to almost anyone who will listen to me, but bought it for two of my friends for their birthdays. When I found out there was a PLUS version of this calculator I was more excited than any one person should be about a calculator, and I didn't even know what the plus stood for. Turns out it's a bunch of small things that us math majors really appreciate; lines over repeating decimals, gcd and lcm, remainders (for modular arithmetic), and a bit more memory than its predecessor. BUT IT'S PREDECESSOR WAS ALREADY AMAZING, so basically this calculator is amazing plus.

    For you calculus students out there that need a scientific calculator for exams: this calculator solves systems of linear equations (with up to 3 variables), quadratics, cubics, does matrix inversion, addition/subtraction and multiplication, gives exact answers (sin(pi/4)=sqrt(2)/2), and is just in general a super easy calculator to use. I've been pimping Casio out for a while now, but seriously, for $15 this is the BEST investment you can make in your math education.

    UPDATE 11/12/2017
    This calculator still works like a dream and beats everything on the market. As a math instructor I've seen probably every scientific calculator out there- certainly all of the TI's- and not one of them even comes close. One of the most important features I didn't mention in my original review was its ability to evaluate definite integrals and also derivatives at a point! That's a crazy feature for a scientific calculator!! I feel just as passionate today about this calculator as I did 5 years ago- do yourself a favor and buy it!

    259 people found this review helpful

    Published on Amazon.com

  • I'm very picky, but this one worked perfect for trig & chem.
    By Sara on 04 July 2018

    So glad I purchased this! I was using a TI previously but found out I was getting 1 in 10 questions wrong on my exams because the keys weren't always registering the number in the calculation. These buttons have been reliable and I've been able to work fast without any errors. They do all the functions I needed for trigonometry and chemistry. I had classmates borrowing my calculator at times because they realized how reliable mine was and how easy the buttons were to understand and use. If I needed to supply one calculator to a college student, this would be the one I'd pick. Now if they need to take calculus, you'll probably want to look for a graphing calculator, but until then, this is all a student needs!

    13 people found this review helpful

    Published on Amazon.com

  • My favorite scientific calculator to date.
    By Philip on 07 October 2017

    An amazing calculator for the price. Does integral and derivative approximations, arbitrary base logarithms, and summations. It can generate random integers in a range and calculate mean, median, and standard deviation for a set of numbers. It can also row-reduce matrices up to 3x3 in size. It also solves quadratic equations and some other equations for you. I'm sure there's a bunch more, but this is the stuff I have used it for thus far. Pretty cool stuff for the price.

    Update 04/25/2019: Literally still works perfectly for all functions. This calculator has gotten me through an entire CS bachelor's degree. It's never failed to deliver for any of my classes from stats, physics 1&2, linear algebra, calc 1-3, some CS courses, etc. Just to add to my previous list of functions, it also does calculations and conversions in various bases (Decimal, Octal, Hex). You can literally type in and do math on numbers in hexadecimal. Wonderful. Truly a great scientific calculator---the most function-filled one I've seen for the price. Whoever was making the design decisions for this calculator should be happy with themselves.

    6 people found this review helpful

    Published on Amazon.com

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