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Question

In order to convert a rational number into its standard form, why do we need to make the denominator positive?
 


Solution

A rational number a/b  is said to be in the standard form if b is positive, and the integers a and b have no common divisor other than 1.

ie,the positive denominator is one of the conditions for a rational number to be a standard one because the standard is defined like that.

So,making denominator positive is one step to making it a standard rational number.

I think it is so for the ease of claculations with rational numbers.

Mathematics

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