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Friday, March 9, 2012

3-9-2012 Irrational, Rational, Approximately Rational?

Teching the Core Curriculum Content Standards
Math Standards: Grade 8 - The Number System
Standards: 8.NS.1-2
The Number System
The goal -
Know that there are numbers that are not rational, and approximate them by rational numbers.
8.NS.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.
Printable Quiz - Level 7
Printable Quiz - Level 6
8.NS.2. Use rational approximations of irrational numbers to compare the size of irrational numbers, locate them approximately on a number line diagram, and estimate the value of expressions (e.g., π2). For example, by truncating the decimal expansion of √2, show that √2 is between 1 and 2, then between 1.4 and 1.5, and explain how to continue on to get better approximations.


  1. I know the Question am gonna ask is very silly but I need help please,can anyone tell me what is irrational number?
    Is 16 an Irrational Number

  2. A good example of an irrational number is the square root of two.