Common Core Math: Grade 8: Number System

In eighth grade, students expand their knowledge of rational numbers to all real numbers, which include irrational numbers such as pi or the square root of 2. Students classify numbers by noting that rational numbers have either finite or repeating decimal expansions. Students use their knowledge of rational numbers to approximate and compare irrational numbers.

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Real Numbers

Explore properties of real numbers.

Classify numbers (CCSS.Content.Math.8.NS.A.1):

Convert between decimals and fractions (CCSS.Content.Math.8.NS.A.1):

Approximate irrational numbers (CCSS.Content.Math.8.NS.A.2):

Order a list of numbers (CCSS.Math.Content.8.NS.A.2):