Videos on pre-algebra. Should be ready for the "Algebra" playlist if you understand everything here.
Adding and subtracting negative numbers.
How to add and subtract fractions.
Multiplying fractions.
Dividing fractions.
Order of Operations.
More Complicated Order of Operations Example.
Basic Exponents.
Negative Exponents.
Fractional Exponents.
Intuition on why a^-b = 1/(a^b) (and why a^0 =1).
Introduction to Exponent Rules.
2 More Exponent Rules with an Introduction to Composite Problems.
Using Exponent Rules to Simplify Radicals or Square Roots.
An Introduction to Logarithms.
Metric Unit Conversion.
Translating Speed Units.
Introduction to the First Two Logarithm Properties.
Introduction to Scientific Notation.
More Scientific Notation Examples.
Unit Conversion Example: Drug Dosage.