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 2:
Create a fraction equivalent to tex2html_wrap_inline28 that has a denominator of 33.

The answer is the fraction tex2html_wrap_inline30 .

Recall that you can multiply any number by 1 without changing the value of the number. (Rule 6). Multiply the fraction tex2html_wrap_inline28 by 1. Recall that 1 has many forms, look for the form of 1 that will result in a denominator of 33.
Since 3 x 11 = 33, use the fraction tex2html_wrap_inline34 as 1.
Now tex2html_wrap_inline36 can be written as tex2html_wrap_inline38 . The product is tex2html_wrap_inline30.
We have created a fraction with a denominator equal to 33 that is equivalent to the fraction tex2html_wrap_inline28.

Now prove to yourself with your calculator that your answer is correct. Calculate 1 divided by 3 and calculate 11 divided by 33; both should yield the same answer. If you are correct, the answers are the same (equivalent) and you have successfully built a fraction.

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Author:Nancy Marcus

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