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.
Subject Area: Mathematics
Grade: 8
Domain-Subdomain: The Number System
Cluster: Level 1: Recall
Cluster: Know that there are numbers that are not rational, and approximate them by rational numbers. (Supporting Cluster) -

Clusters should not be sorted from Major to Supporting and then taught in that order. To do so would strip the coherence of the mathematical ideas and miss the opportunity to enhance the major work of the grade with the supporting clusters.

Date Adopted or Revised: 02/14
Content Complexity Rating: Level 1: Recall - More Information
Date of Last Rating: 02/14
Status: State Board Approved
Assessed: Yes


  • Item Type(s): This benchmark may be assessed using: MC , MS , EE , MI item(s)

  • Assessment Limits :
    All irrational numbers may be used, excluding ??. Only rational numbers with repeating decimal expansions up to thousandths may be used.
  • Calculator :


  • Context :

    No context