As a math teacher, I can this calculator all students (who do not need GTR) recommend. Here exactly is typed, what one also writes the book - you no longer have in each invoice think twice (once for the book and once for the computer). Apart from the computer is the result also like how the math teacher wants them, so as geküzte breaks or simplified root Terme. With partial square root or rationalizing the denominator I can shock no student who has this machine. The piece is actually approved in Baden-Württemberg for the elementary and secondary school examination. Unfortunately swear 90% of my colleagues are still on the cumbersome and outdated Ti30 at which since the 80s has actually geänadert only the design.