**Rule 17:**- To build a fraction is the reverse of reducing the fraction. Instead of searching for the 1 in a fraction so that you can reduce, you insert a 1 and build.

**Problem 4:**- Create a fraction equivalent to
that has a denominator of 40.
**Answer:**- There is no simple fraction with a denominator of 40 that is equivalent to the fraction. Answer is the fraction .
**Solution:**- The fraction
is already reduced. We need an
integer that when multiplied by 7 will yield 40. There is no such integer.

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