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Основно съдържание

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Math

Kansas Math

Grade 8: The Number System

Know that there are numbers that are not rational, and approximate them by rational numbers.

8.NS.1

Fully covered
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.

8.NS.2

Fully covered
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. π^2). For example, for the approximation of 68, show that √68 is between 8 and 9 and closer to 8