(Print) Use this randomly generated list as your call list when playing the game. There is no need to say the BINGO column name. Place some kind of mark (like an X, a checkmark, a dot, tally mark, etc) on each cell as you announce it, to keep track. You can also cut out each item, place them in a bag and pull words from the bag.
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x=x
Running out of space
Doing the problem in the most convoluted way possible
Huge expansion
Forgetting the other solution to the quadratic
Wolfram Alpha
so if 3-2=1
then x-y=z
then 2=3-1
so y=x-z
Dividing by zero
Checking your answer and getting a really weird result