This is my second purchase on this Texas Instruments - TI-30XS because my grandson lost his at his school, he used it a lot. He learned how to use it by his class instructor since his day one last Sept. I myself like it a lot because it has more features. The features have 4 display lines and math and science exploration for high school student. My grandson said that the teacher recommended every student to have a TI-30XS for classroom use. Also, there are more fine features in using MathPrint, 1 & 2 Variable Statistics, Step by step fractiion simplification, fraction/decimal converson, trig. log, exponents, edit, cut and paste entries, and (x-y) tables. Its calculator has a slide case and it is Solar/Battery. Right now, my grandson learns how to use fractions daily. He got a B on how to use this calculator and a C on worksheet without using this calculator. He loves it very much. I am still learning how to use this calculator but enjoy learning. Thankful for this new technology!