8.NS.1

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.

- Cards to sort as an introduction to decimals that terminate, all digits repeat, and some digits repeat.
 * [[file:repeating_decimals_slides.ppt]]

- powerpoint for converting decimals where all of the digits repeat.

Gives two columns...one with rational numbers and one with irrational numbers. Then asks students to sort additional numbers into the two columns based on identified characteristics. i [|Polygraph] for Rational vs irrational numbers