We need to teach a 3rd grade lesson on skip counting using the TI-15 calculator. We cannot find instructions online to do this lesson. Please advise. Our curriculum gives us instructions for two different calculators, but the TI-15 is not one of them. Could you please respond quickly as our pacing guide has us teaching the lesson tomorrow, 8/25/11 Thank you for your prompt attention. Tina Puckett

SOURCE: Texas Instruments calculator TI-30XIIS

Theres an A b/c button. Pretend its 90/100 Do 90 then press A b/c then type 100 and =.

SOURCE: My TI-89 calculator turns on, but gets stuck on window editor

If you're willing to have all RAM cleared, try a hard reset.

Press and hold the 2ND, Left-arrow, and Right-arrow keys.
Press and release the ON key.

SOURCE: my graphing calculator reads err:invalid dim. How do I fix that?

A previously posted solution, taken from my Web page without permission, was removed by the admins at my request. The person who posted it should have asked first and should have credited me. Here is my solution:
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This message has several possible causes.

• If you get this when making some kind of plot, you probably forgot that you have one of Plot1 Plot2 Plot3 turned on, and it refers to two lists that don't have the same length. The cure is to press [Y=] and turn off the unwanted plot.
• If you’re actually doing something that needs lists, such as a regression, but your lists don’t have the same length, you get this message. Press [STAT] [1] and check your lists.
• You also get this message when you give the TI-83 a list or matrix where it expected a variable or number, or vice versa. For instance, on the STAT PLOT screen, you may mean to press [2nd] [L1] but if you miss the [2nd] you actually type a Y. In the same way you might type a Z where you intend to type L2.
• Karl Wein offers another possibility. You can create a list called L1, but that is not the same as the predefined list called L1 (note the small-capital L), and of course similarly for lists 2 through 6. If you accidentally delete a predefined list from the editor, make sure to bring it back with the SetUpEditor command.