Free pre-algebra lessons, videos, and practice problems for math teachers and students.

Rounding to the nearest tenth and hundredth
Adding Positive and Negative Numbers
Adding Fractions with a Common Denominator
Adding and Subtracting Fractions (with different denominators)
Multiplying Fractions
Dividing with Fractions
Converting between Percents, Decimals, and Fractions
Classifying Rational Numbers
Factors and Multiples
Greatest Common Factor
Order of Operations
Percent of a Number
Percent of Change
Pythagorean Theorem
The Distributive Property
Solving One-Step Equations
Solving Two-Step Equations
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