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
Factors and Multiples
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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