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Grade 8 - Number & Operations
Standard 8.N.1.4 - Classify whole numbers, natural numbers, and integers.
Classify real numbers as rational or irrational. Explain why the rational number system is closed under addition and multiplication and why the irrational system is not. Explain why the sum of a rational number and an irrational number is irrational; and the product of a non-zero rational number and an irrational number is irrational.