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# Number Lines

## On a number line, values can represent any real number. Number lines are useful dealing with concepts like absolute value, and real numbers.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Real Number Line Graphs

This concept reviews the real number system and how to graph inequalities on a real number line.
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## Number Lines: Freezing Cold Comparison

Number Lines Interactive
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## Inequalities on a Number Line

Shows how to represent an inequality on a number line.
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## Graphing Real Numbers on a Number Line - Overview

Overview
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