Algebra 1 - 4th Edition

Chapter 1: Operations, Expressions, and Equations

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1.1 The Set of Real Numbers

http://mathworld.wolfram.com/RealNumber.html
This page contains a description of the set of real numbers and what it entails.

http://en.wikipedia.org/wiki/Real_number
This article includes a definition of real numbers, their uses and the history behind them.

1.2 Absolute Value

http://www.freemathhelp.com/absolute-value.html
This page has notes on the definition of absolute value and how to solve for it.

http://www.coolmath.com/algebra/Algebra1/05AbsValueEq/01_review.htm
This site contains a review on absolute value and shows how to visualize it on a number line.

1.3 Adding and Subtracting Real Numbers

http://www.math.com/school/subject1/lessons/S1U1L11DP.html
This page contains notes on adding and subtracting real numbers with several examples.

1.4 Multiplying and Dividing Real Numbers

1.5 Variables and Expressions

http://www.freemathhelp.com/Lessons/PreAlgebra_Variables_and_Expressions_BB.htm
This page contains a video tutorial with notes on variables and expressions.

http://www.mathscore.com/math/practice/Single%20Variable%20Equations/
This site has online practice problems with variables.

1.6 Equations and Formulas

http://www.mathsisfun.com/algebra/equation-formula.html
This article contains a definition and explanation of equations and formulas with examples.

http://www.math-drills.com/algebra/algebra_missing_numbers_operations_0109_variables_001.html
Printable worksheets with many types of practice problems solving equations. See versions B, C, D, etc.

http://www.coolmath.com/crunchers/algebra-problems-solving-equations-1.htm
http://www.coolmath.com/crunchers/algebra-problems-solving-equations-2.htm
Online practice solving equations with addition and multiplication of variables.

1.7 Rates and Unit Analysis

http://oakroadsystems.com/math/convert.htm
This site shows how to convert units of measurement and shares examples.

1.8 Precision and Accuracy

http://www.mathsisfun.com/accuracy-precision.html
This page explains precision and accuracy and has diagrams to show the differences between them.

http://www.chem.tamu.edu/class/fyp/mathrev/mr-sigfg.html
This page summarizes the use of significant digits to correctly reflect the accuracy and precision of measurements, such as with beakers and graduated cylinders. Includes examples and practice problems.