**Rule 1: All fractions have three parts: a numerator, a denominator,
and a division symbol. In the simple fraction, the numerator and the
denominator are integers.**

**Problem 4:** 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. Note -7 + 7 = 0.

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Author: Nancy Marcus

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