Casio's versatile fx-260 solar scientific calculator is easy enough for daily calculations, but it is also advanced enough to conquer the most complex mathematical equations including trigonometry, pre-algebra, algebra I and II, 1- and 2-variable statistics, mean/sum/elements and standard deviation, exponentials, fractions, scientific notation, and polar/rectangular conversions. Its solar power provides long life and dependability. With over 140 features and calculations, this 10-digit X calculator is approved for use on the SAT, AP, PSAT/NMSQT, and ACT exams. In fact, in 2002, the fx-260 LCD calculator was named the official calculator of the GED examination. A backspace key is included to correct any mistakes. Ideal for any math student, the solar calculator is equipped with a hard, slide-on case.