Having a good scientific calculator is important for all high school students and for those who face university exams of analysis, geometry, general mathematics and so on. A portable scientific calculator is certainly mandatory but it is important to know that an absolutely complete calculator can also be used on the computer. On Windows 7 the calculator supplied with Windows has improved enormously, providing 4 types of calculator (standard, scientific, statistical and programmer) and including other functions such as the conversion of units of measurement and the calculation of dates. With the Windows calculator, however, it is difficult to write more complex formulas, because the display where the numbers are shown is small. An even better scientific calculator therefore, for its "piece of paper" mode, is Red Crab.
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Red Crab can be downloaded and used for free to write math operations and even complex formulas, thanks to a very intuitive and spacious editor. It is not a program to solve equations, functions and integrals but a real calculator where you can write numbers, symbols and operations of any type and immediately get the result. The most important feature of RedCrab is the graphical interface that allows you to write as you would on a sheet of paper, full screen, with full freedom to scribble. Algebraic equations such as fractions, square roots, exponents, trigonometry operations, logarithms and so on can be solved.
The biggest difference compared to the Windows Calculator is the ability to add characters and symbols anywhere, just as it would be possible on plain paper.
Multiple functions and equations can be written on the same page, with the possibility of using the results for further calculations.
The scientific calculator opens two windows at startup, the main window with basic commands and the writing area and a smaller window with functions and symbols. Everything written in Red Crab can be printed. By downloading the program you also get a user manual (in English) which explains how to write mathematical formulas, expressions, symbols and so on.
This Red Crab is a pure and simple scientific calculator, with functions for solving the steps of an equation and it does not even allow you to draw function graphs.
Other more powerful scientific calculators, with graphs and mathematical operation solvers, are on another page.
