Warning - Use with caution. Please don't get into trouble, and look up once in a while so you understand what's going on.
This is for a CASIO calculator, so it might be a bit different for yours. A fraction button is essential for this.
1. Press the fraction button twice, so you have a three blank boxes with a line separating each box.
2. Put a multiplication sign next to the fraction stack.
3. Repeat steps 1 and 2, then do step 1 again.
4. Go back and delete the multiplication signs.
You now have a blank template for X's and O's! It will take a lot of manoeuvring to play, but use multiplication signs for X's and a zero for O's. Have fun!

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