Texas Instruments TI-30XIIS Teachers Guide - Page 5

About the TI-30XÚS Two-Line Display The first line (entry line) displays an entry of up to 88 digits (47 digits for the stat and constant entry lines). Entries begin on the left; those with more than 11 digits scroll to the right. Press ! and " to scroll the entry line. Press % ! or % " to move the cursor immediately to the beginning or end of the entry. The second line (result line) displays a result of up to 10 digits, plus a decimal point, negative sign, x10 indicator, and 2-digit positive or negative exponent. Results that exceed the digit limit are displayed in scientific notation. Display Indicators Refer to Appendix B for a list of the display indicators. Order of Operations The TI-30X ÙS uses the Equation Operating System (EOSTM) to evaluate expressions. The operation priorities are listed on the transparency master in Chapter 4, Order of Operations and Parentheses (page 41). Because operations inside parentheses are performed first, you can use D E to change the order of operations and, therefore, change the result. 2nd Functions Pressing % displays the 2nd indicator, and then accesses the function printed above the next key pressed. For example, % b 25 E < calculates the square root of 25 and returns the result, 5. Menus Certain TI-30X ÙS keys display menus: z, % h, L, % t, u, % w, H, I, % k, = % d, % , and % . Press ! or " to move the cursor and underline a menu item. To return to the previous screen without selecting the item, press -. To select a menu item: • Press < while the item is underlined, or • For menu items followed by an argument value (for example, nPr), enter the value while the item is underlined. The item and the argument value are displayed on the previous screen. Previous Entries # $ After an expression is evaluated, use # and $ to scroll through previous entries, which are stored in the TI-30X ÙS history. You cannot retrieve previous entries while in STAT mode. Error Messages Refer to Appendix C for a listing of the error messages. Last Answer (Ans) The most recently calculated result is stored to the variable Ans. Ans is retained in memory, even after the TI-30X ÙS is turned off. To recall the value of Ans: • Press % i (Ans displays on the screen), or • Press any operation key (T, U, etc.) as the first part of an entry. Ans and the operator are both displayed. © 1999 TEXAS INSTRUMENTS INCORPORATED TI-30X ÙS: A Guide for Teachers iv