Website Address: https://library.curriki.org/oer/8NS1-Know-that-numbers-that-are-not-rational-are-called-irrational
Know that there are numbers that are not rational, and approximate them by rational numbers: 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.