divide by zero: why not?

Posted on December 16, 2015


Student couldn’t *quite* remember how she had remembered why you can’t divide by zero, and she started by saying “I knew 0 / 9  was zero because …”   and she drew a 9 and the “gazinta” and the 0, and yes, you could put a “zero” on top and do standard long division.

So, taking that cue, I put the zero on the out side and asked, “what would you put on top so that 0 x that was 9? ”  And since nothing made sense…

A nice visual…

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