#
Rule 7: Different Faces of the Number 1

**The number 1 can take on many forms. 4 - 3 = 1 and 10 - 9 = 1
can be used as a substitution for the number 1 because they have a
value of 1. When the numerator of a fraction is equivalent to the
denominator of a fraction, the value of the fraction is 1. This only
works when you have a legal fraction; i.e., the denominator does not
equal zero. You can substitute one of these fractions for the numer
1.**

**Example 1:**

**Example 2:**

**Example 3:**
According to Rule 1, is not a legal
fraction because the denominator is zero. Therefore is undefined.

**Example 4:** The
numerator is equivalent to the denominator.

**Example 5:** as long as
.

**Work the following problems and click on Answer
to check your results.**

** **
**Problem 1:** Find 9 x 1.

**Answer.**

**Problem 2:** Find .

**Answer.**

**Problem 3:** Write in three
other ways.

**Answer.**

**Problem 4:** Write in three
other ways.

**Answer.**

**Problem 5:** Write in three
other ways.

**Answer.**

**Problem 6:** Write 1 in three other ways.

**Answer.**

**Problem 7:** Write 7 as a fraction in three ways.

**Answer.**

**Problem 8:** Write -11 as a fraction in three ways.

**Answer.**

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Author: Nancy
Marcus

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