**
Rule 1: The denominator of any fraction cannot have the value zero. If the
denominator of a fraction is zero, the expression is not a legal
fraction because it's overall value is undefined.**

**Problem 1:** Write the numerator, denominator, and
division symbol for the simple fraction .

**Answer.** This is not a
fraction; its value is undefined because the denominator has a value
of zero.

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Author: Nancy Marcus

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