Casio FX-991CW ClassWiz Series is designed for the teaching and studying of today. Packed with features to encourage learning. With the convex key design makes it easy to press any key from any angle. Simple key layout for frequently used keys are placed in convenient locations. Includes MathBox, take math-play and curiosity to the next level with probability simulations such Dice Roll or Coin Toss. Calculator apps feature. Easily select a calculator app from the Home Screen that is suitable for the type of operation that you want to perform. Spreadsheet function is useful for learning statistics, formulas, and more. Handles up to five columns and 45 rows (For a maximum of 170 data points). These features plus a variety of functions available in other calculator apps help to boost students curiosity toward math learning.