Before you understand this concept, you are advice to read:
What are Positive Rational Numbers ?
What are Negative Rational Numbers ?
Rational Numbers are of two types:
Positive Rational Numbers
Negative Rational Numbers
Base on above types of rational numbers, multiplication of rational numbers is further divided into:
Multiplication of Positive Rational Numbers
Multiplication of Negative Rational Numbers
Multiplication Negative and Positive Rational Numbers
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