Grade 8 · The Number System

CCSS.MATH.CONTENT.8.NS.A.1

Know that numbers that are not rational are called irrational. Understand informally that every number has a decimal expansion; for rational numbers show that the decimal expansion repeats eventually, and convert a decimal expansion which repeats eventually into a rational number.

Read this standard on the official Common Core site

Lessons that teach this standard

• Rational and Irrational Numbers

  What makes a number irrational, why every rational number has a terminating or repeating decimal, and how to place an irrational number on a number line.