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# Variable Expressions

## Letters representing numbers in arithmetic expressions

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.
• PLIX

## Variable Expressions: Write Equations

Variable Expressions Interactive

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## Variable Expressions Quiz

Quiz for Variable Expressions.

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• 2
• Critical Thinking

## Variable Expressions Discussion Questions

A list of student-submitted discussion questions for Variable Expressions.

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## Variable Expressions Pre and Post Read

To encourage students to generate questions, activate their prior knowledge, and collect information to answer their own questions using a Question and Answer Table.

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• Real World Application

## Planets

How long does it take for each planet to rotate around the sun in terms of the earth's rotation?

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• Study Guide