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[[File:Multiplcation3.jpg|center]]
[[File:Multiplcation3.jpg|center]]
The multiplication of ]https://en.wikipedia.org/wiki/Integer integers] (including negative numbers), [https://en.wikipedia.org/wiki/Rational_number rational numbers] (fractions) and [https://en.wikipedia.org/wiki/Real_number real numbers] is defined by a systematic generalization of this basic [[definition]].
The multiplication of [https://en.wikipedia.org/wiki/Integer integers] (including negative numbers), [https://en.wikipedia.org/wiki/Rational_number rational numbers] (fractions) and [https://en.wikipedia.org/wiki/Real_number real numbers] is defined by a systematic generalization of this basic [[definition]].
''Multiplication'' can also be [[visualized]] as counting objects arranged in a [https://en.wikipedia.org/wiki/Rectangle rectangle] (for whole numbers) or as finding the area of a rectangle whose sides have given lengths. The area of a rectangle does not depend on which side is measured first, which illustrates the commutative property.
''Multiplication'' can also be [[visualized]] as counting objects arranged in a [https://en.wikipedia.org/wiki/Rectangle rectangle] (for whole numbers) or as finding the area of a rectangle whose sides have given lengths. The area of a rectangle does not depend on which side is measured first, which illustrates the commutative property.