– Scientific Calculator 417 Functions GCSE School Black OS-991ES PLUS 2 | Math Scientific Calculator, 2-Line Written Display, Solar & Battery Power for GCSE, Secondary High School College

A simple and easy to use product which does the job for my daughter who has just started secondary school. I would recommend this for anyone else.

Sturdy calculator. Doesnt feel cheap or anything which is great. Its very easy to use. Didnt take little getting used to but the instruction of the buttons on the inside of the case do massively help. Took this into my Level 2 Electrical exam and passed being able to comfortable answer all questions that had equations. Highly recommend

Casio is the brand but it was about £10 more than this one and so far (last 6 months) this has functioned perfectly well and no issues at all. Definitely good value for money. Hope that helps.

Very Good

Very useful for my son's exam this year.

My daughter used this for her maths exam she said it was perfect.

At first glance, you might expect this calculator to be a clone of the discontinued Casio fx-991EX. It has the same white casing, the same black, blue and white buttons, and a broadly similar key layout. However, you will see from the photograph that the Osalo has a text interface rather like the old fx-991ES model from 2010, whereas the fx-991EX has a modern icon-based menu. This calculator is a capable enough machine for GCSE or iGCSE Mathematics, but lacks a couple of features now essential for A-Level exams. Foremost among these omissions is a Distribution Function, so there is no way to calculate Normal probabilities without using tables, and for Binomial or Poisson probabilities you have to rely on longhand methods. As for Inverse ("lookup") probabilities, you've got nothing. There is no Spreadsheet function, no Ratio tool, and no Inequality solver, although these would be considered useful rather than essential in an A-Level exam. Some of the other functions have limitations. The Simultaneous Equation solver can solve up to 3 unknowns (Casio 4 Unknowns). The Polynomial Solver can manage up to Degree 3 (Casio Degree 4). Matrix Mode can handle up to 3 Matrices (Casio 4), and each of these is limited to 3x3 (Casio 4 x 4). A brief test of its functions shows that it otherwise works fine and with quick results. The stored constants are all only accurate to about 5 s.f. so use the more official figures if you are calculating with these, or else be sure to round your answers. Overall, fine for GCSE Higher Tier, but go for the new 991CW or CG50 if you need something more suited to Maths A-Level or GCSE Statistics.

All great

Calcolatrice motlo comda ed utile per mio figlio che fa le superiori.

erfüllt seinen zweck Top !!!

Es estupenda. Muy buena compra

AMAZING, Works too fine

Der beste Taschenrechner den es für diesen Preis gibt.Meine Kinder sind begeistert.Er kann alles!!Sehr zu empfehlen