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Zero divided by anything is always zero.
When I type any number divided by zero into my calculator, it flashes, "ERROR, ERROR," but I say it's possible. "It's not possible to divide by zero," my math teacher says, but who cares about her? Here's my data after graphing it out: If any positive number is divided by zero, it's infinity, if it's negative, it's negative infinity, and zero divided by zero is one. NO NO, you cannot divide by zero, really. See my discussion post.
The reciporical of any number is one over that number, as long as it is defined (i.e., not one over zero). This also applies to negative fractions: 1 divided by a negative number is always negative.
Zero divided by any number is always zero and a number cannot be divided by zero.
A negative number is less than zero.