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Mathematics 12 Online
OpenStudy (anonymous):

Which number is an integer , a rational number, and a real number?

OpenStudy (mathstudent55):

The integers are all the natural numbers, 1, 2, 3, ... and the number 0, and the reciprocals of the natural numbers, -1, -2, -3, ... A rational number is a number that can be written as a fraction of integers. A real number is a number from the set containing all rational and irrational numbers.

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