4 TI-82 Introduction
room. Now use the arrow keys to put the cursor at the end of the expression. Note that as soon as you
move the cursor with an arrow key, the calculator leaves Insert mode. We are now going to change 7 to
7.6. Since the cursor is at the end of the expression, the calculator need not be in Insert mode to make
this change (though it would make the change just the same if it were in Insert mode). After the 7 type
in .6, and press ENTER to display the value of the new expression, 39.86.
Now suppose we want to evaluate
by editing the last expression. Press 2nd [ENTRY] to
reproduce the last expression, and use the arrow keys to place the cursor over the 4. Type in 5.2. Since
5.2 contains one less character than 4.85, the last digit of the 4.85 is still on the screen and must be
eliminated. The cursor should now be resting on this last digit (5) of the old 4.85. Press the DEL key to
delete this character. (Each time the DEL key is pressed, it deletes the character at the cursor position.)
Press ENTER to display the value of the expression, 42.52.
Next, suppose we want to evaluate
. Notice that this expression could be produced by
editing the last expression we evaluated, but it really looks more like the expression 3+5*7 that we
evaluated some time earlier. One of the nice features of the TI-82 is that it stores as many previous
entries as it can. Press 2nd [ENTRY] once to produce the last expression. Now press 2nd [ENTRY] again.
Note that you now see the next-to-last expression we evaluated. If you press 2nd [ENTRY] one more
time, you will see the expression we evaluated before that, which was 3+5*7. You may now edit this
expression as before to produce 3+5*8. Press ENTER to evaluate it. If you continue to press 2nd
[ENTRY] beyond the calculator's ability to recall previous entries, it will return you to the most recently
evaluated expression.
Clearing the Home screen
By now your Home screen may look pretty full, and the original expressions you entered may have
scrolled off the top of the screen. Any time you want to erase everything on the Home screen, just press
the CLEAR key, located below the arrow keys. If you want to retrieve these erased expressions, you may
still do so by pressing 2nd [ENTRY] as often as needed.
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