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Common Core Math Alignment:
6.NS.5. Understand that positive and negative numbers are used together to describe quantities having opposite directions or values
6.NS.6. Understand a rational number as a point on the number line.
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.
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
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