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1. 

   Ayla on September 30, 2015 at 2:41 pm

   108 of 108 people found the following review helpful

   
   Best calculator you’ll ever own, November 2, 2012

   By 

   Ayla (Stanwood, WA, US) –

   Verified Purchase(What’s this?)

   This review is from: Casio fx-115ES PLUS Engineering/Scientific Calculator (Office Product)

   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 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, linear systems, 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.

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2. 

   CECIL ERDLY or BETTY ERDLY on September 30, 2015 at 2:54 pm

   49 of 56 people found the following review helpful

   
   FOUR CALCULATORS COMPARED, December 10, 2012

   By 

   CECIL ERDLY or BETTY ERDLY (FL) –

   Verified Purchase(What’s this?)

   This review is from: Casio fx-115ES PLUS Engineering/Scientific Calculator (Office Product)

   Four great little calculators for under $20! The Author (TA) owns 3 of the 4 (he borrowed the 4th calculator to write this review), therefore he does not have to make the difficult decision of which one to buy. Prices from Amazon October 2013.

   Your comments, corrections, questions, omissions are encouraged, even welcomed. Thanks.

   CASIO FX-115ES PLUS 16.24 (C)
   CANON F-792SGA 15.14 (N)
   SHARP EL-W516B (EL-W516X 17.30) (S)
   TI-36X PRO 19.97 (T)

   COMPLEX NUMBERS
   C,N exact radical form
   S can only be stored in M, division can not be entered as fraction
   T does not require COMPLEX mode, must scroll to see all digits

   STATISTICS/REGRESSION
   C,N,S quadratic regression calculates both x1′ and x2′
   N calculates mode and range
   S does not calculate min Q1 med Q3 max, easy to RCL vars and to calc x’ & y’
   T cubic regression, 2-Var Stats menu includes x'(y) and y'(x) for linear reg

   DISTRIBUTION
   C,T normal, inverse normal, binomial, Poisson
   N,S P(x) Q(x) R(x) x>t

   BASE NUMBERS
   N binary numbers displayed in blocks of 4-digits
   S can not + – * / different bases (no b o d h prefix/suffix), PEN (base 5)
   T calculates LOGIC nand

   POLYNOMIAL EQUATIONS
   C,N 2nd degree (quadratic formula) exact radical form
   C,T calculates vertex of parabola (S functions can be programmed)
   N 4th degree polynomial (includes complex roots)
   T gives option of storing results in variable memories

   POLYNOMIAL INEQUALITY
   C,N exact radical form of 2nd degree polynomial
   N 4th degree polynomial
   S,T no inequality

   SYSTEMS OF EQUATIONS
   C Infinite Solution & No Solution enunciators
   N solves 4X4 system
   S 4X4 matrices can solve 4X4 system using Inv(4X4)X(4X1)
   S calculates determinant of Cramer-method denominator
   T gives results of 2-equation 3-variable system in terms of z

   FUNCTION TABLE
   C 2 functions, f(x) & g(x) calculated side-by-side
   N 1 function, f(x)
   S no function table
   T 1 function, Auto scrolls up or down from initial value of x
   T x=? inputs user values for x (Auto is disabled)

   MATRIX
   C,T ref & reduced-ref
   N, S 4X4 matrices, 4th matrix (matrix D)
   N calculates adjoint matrix
   S fill, cumulative, augment, random, matrix>list
   N,S,T identity matrix

   VECTOR
   N 4th vector (vector D)
   S no vector mode (uses LIST to calculate dot & cross products)

   LIST
   C,N no list mode
   S 4th list (list 4), square, cube, reciprocal can be applied to lists
   S sort A&D, fill, cum, difference list, aug, abs (sqrt of sqr-sum)
   S min max mean median sum product SD variance, list>matrix
   T list formulas accept all calculator functions and real numbers

   UNIQUE FEATURES
   C VERIFY checks results of number & algebra expressions
   C PreAns (PreAns + Ans generates Fibonacci Sequence)
   C recurring decimal (gives ALL 60 digits of 1/61)
   C remainder division (N,T have mod function)
   C old FX-115MS SOLVE did not require comma-variable to select
   C old FX-115MS % could calculate percent + or – & percent change
   C,N multi-statements (displays all 6 answers of ambiguous case with =)
   C old FX-115MS could COPY multi-statements
   C,N independent memory M (generates & totals A or G sequence with =)
   C,N Square Root & Ans require single keystroke (not Shift 2nd 2nd-F ALPHA)
   N RATIO solves 3rd or 4th term of direct proportion
   N 38 math & science & engineering formulas
   S DRILL quizzes & grades user on basic add, sub, mult, div
   S % + or – (with single keystroke of %), (C,N,T % only changes % to decimal)
   S Simpson’s rule, N=1, exact & fast for 2nd & 3rd degree polynomials
   S no Int, Mod, Prime Factors, PI (product of sequence), GCF, LCM
   S GCF & LCM can easily be calculated with fraction button
   S SOLVER only solves for X
   S 4 formula memories, 4 definable memories, 4 constant (K) calculations
   S CTLG gives complete catalog of all available functions for each mode
   S OFF displays SHARP logo with name and telephone number of owner
   S no parentheses for argument (X) = fewer keystrokes (log trig trig-h R<>P)
   S 9 Metric/Engineering Suffixes (femto – Tera)
   T Multi-Tap Keys cycle through multiple functions when pressed (! nCr nPr)
   T recall (RECALL VAR) displays menu of all 8 memory variables & stored values
   T memory X can be accessed with a single keystroke
   T set-op & op Stored Operations (up to 44 characters) applied to ANS or entry
   T can not clear old data with single keystroke (matrix, vector, poly, sys)
   T no cube, cube-root, independent-memory (M)

   FRACTION DECIMAL CONVERSIONS
   C S<>D (improper>repeating>decimal), shift a b/c<>d/c (mixed)
   N F<>D (improper<>decimal), shift a b/c<>d/c (mixed)
   S CHANGE…

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3. 

   Amazon Customer on September 30, 2015 at 3:18 pm

   21 of 22 people found the following review helpful

   
   even better version of an already excellent calculator, February 16, 2013

   By 

   Amazon Customer (MA, USA) –

   This review is from: Casio fx-115ES PLUS Engineering/Scientific Calculator (Office Product)

   Vine Customer Review of Free Product (What’s this?)

   (Review from High School student with math/science concentration):

   I have previously used the FX115ES calculator (this one is the “PLUS” version, of course), which I liked a lot, found very useful for all my math/science classes. What’s telling is that I also have a very nice graphing calculator, the TI-SIlver Plus, but when I want to use a calculator, I always prefer the Casio.

   So the new one is even better. Why?

   Firstly, it has all the features of the “non plus” version:
   1. many useful and easily accessible function keys, such as for integral, derivative, log, log-base-x, hyp trig, fraction, factorial, variable substitution, solving 1-var equation, etc.
   2. displays answer in fraction form or decimal, allowing easy switching between the two with one button
   3. displays answers in simplified form: e.g., you enter “sqrt 24” it shows 2 sqrt(6) using the proper symbol of course (hit decimal button to get 2.xxx form); calcs with pi are shown using the pi symbol until you hit the decimal display button
   4. stat functions such as mean, median, quartile, percentile, as well as regression
   5. solving simultaneous equations in 2 or 3 vars, quad & cubic equations in 1 var
   6. many many other useful functions, such as polar-degree conversion, unit conversions, scientific constants

   Additional features in the PLUS version:
   1. display repeating decimals in bar notation
   2. modulus function
   3. finite product (product of a finite series of values)
   4. GCD and LCM calculations
   5. access to “answer” and “previous answer” (i.e., answer to previous two calculations)
   6. solving quad & cubic inequalities (not just equations)
   7. normal, inverse normal, binomial, and Poisson distributions (both cumulative and prob density)
   8. lots more, but you get the idea

   All this for an insanely low price! (Crazy Eddie isn’t involved, for those who get that reference.)

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