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A real number is a number that produces a positive or zero result when squared.

A rational number is any number that can be expressed as a fraction. Thus, terminating and recurring decimal numbers and integers are rational numbers because they can all be expressed as fractions.

A counting number is a whole number greater than 0 i.e. 1,2,3,4 etc.

An example of a number that fits all three sets of criteria is 22. (It could be any number from 1 upwards)

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