In all likelihood, all the numbers that you will come across during school will belong to the Real number system.
In the UK , it is only when you study "Further Pure" mathematics at A-levels, or at university that you will study complex numbers which belong to a set that is the next step beyond Real numbers.
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The real number system is a number system using the rational and irrational numbers.
It would be a bit stupid to call a system the real number system if real numbers were not a part of it!
The unit for real numbers is the number 1.
100 is an element in the real number system. It is a member of the set of real numbers.
-29 is an element of the real number system. That is to say, it belongs to the set of real numbers.