Fractions have a top number, which is called the numerator, and a bottom number, which is known as the denominator. This combination of numbers represents how a part relates to a whole. If you have a negative number or variable in the denominator of a fraction, the fraction is not in simplest form, according to traditional mathematics. To state the fraction properly, you must take measures to convert the negative value in the denominator to a positive one.

Write the fraction. For example, you might have 5/10.

Multiply the numerator and denominator of the fraction by 1/1. This is the same thing as multiplying the fraction by 1, and 1 times any number is that number. In this example, you would multiply 5 by 1 to get 5 and 10 by 1 to get 10. Therefore, the fraction would become 5/10.

Reduce the fraction to simplest form if necessary. In this example, you can divide 5 and 10 by 5, leaving 1/2 as the final answer.
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