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Real Number System

• Important subsets of the real numbers are: the natural numbers, the whole numbers, the integers, the rationals, and the irrationals.

• The number line can be used to graph sets of numbers.

• Each positive number has 2 square roots. The positive one is called the principal square root.

• Use decimal approximations of irrational numbers to compare and order a set of real numbers that includes some irrationals.