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# Basic Principles of Algebra I

54 CQ
12 Lessons
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4 CQ
1. Introduction to Variables in Algebra
A lesson with Math Fortress

Ready to learn the basics of algebra? Math Fortress introduces you to variables – what they are, how they operate, and the ways in which they are written.

Ready to learn the basics of algebra? Math Fortress introduces you to variables – what they are, how they operate, and the ways in which they are written.

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4 CQ
2. Evaluating Expressions in Algebra
A lesson with Math Fortress

Take your algebra skills to the next level! In this math lesson, learn about true or false statements and simplifying numerical and variable expressions.

Take your algebra skills to the next level! In this math lesson, learn about true or false statements and simplifying numerical and variable expressions.

• Playing
3 CQ
3. Grouping Symbols in Simple Expressions
A lesson with Math Fortress

In this math lesson, learn the proper way to simplify numerical expressions using grouping symbols, nested grouping, and the order of operations.

In this math lesson, learn the proper way to simplify numerical expressions using grouping symbols, nested grouping, and the order of operations.

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6 CQ
4. Evaluating Expressions with Variables
A lesson with Math Fortress

Are you ready to tackle fraction bars and variables? Learn how to evaluate expressions, fill in the blank, and create true statements in this algebra lesson.

Are you ready to tackle fraction bars and variables? Learn how to evaluate expressions, fill in the blank, and create true statements in this algebra lesson.

• Playing
3 CQ
5. Closed vs. Open Sentences in Algebra
A lesson with Math Fortress

If learning algebra, you understand there's a difference between expressions and equations. Learn about open and closed sentences, and how equations relate.

If learning algebra, you understand there's a difference between expressions and equations. Learn about open and closed sentences, and how equations relate.

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