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# In mathematics, the natural numbers are used to count (or enumerate) objects, such as the objects in a collection or set. These have been defined by the Peano axioms. Natural numbers can be used to count objects (e.g. number of students in a class), to measure lengths (e.g. number of meters in a yard), or to measure rates (e.g. number of miles per hour). The first three numbers (1, 2, and 3) are the first three counting numbers.

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##### Catherine R.

Missouri State University

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Oregon State University

##### Samuel H.

University of Nottingham

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Webster University

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Rigid Motions (Isometries)

Volume

Terminology

Relationships Within Triangles

##### Catherine R.

Missouri State University

##### Heather Z.

Oregon State University

##### Samuel H.

University of Nottingham