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# Definition of Variable

## A variable can be any unknown value, and will be a critical part of our curriculum beginning with algebra all the way up through calculus!

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.
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## Definition of Variable

by CK-12 //at grade
Write algebraic expressions and equations using variables.
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• PLIX

## Climbing Mountains

by CK-12 //at grade
Definition of Variable Interactive
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## The Language of Algebra: A Sample Application

by CK-12 //at grade
This video demonstrates a sample use of the principles of the Language of Algebra.
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5
• Video

## The Language of Algebra: An Explanation of the Concept

by CK-12 //at grade
This video provides an explanation of the concept of the language of Algebra.
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