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**Khan Academy**

The Khan Academy is a not-for-profit organization with the goal of changing education for the better by providing a free world-class education to anyone anywhere.

All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get a leg up in earthly biology. The Khan Academy's materials and resources are available to you completely free of charge.

The first math topic. Start here if you want to learn the basics (or just want to make sure you know these topics). After this, you should be ready for algebra.

- Adding and subtracting positive and negative whole numbers. Starts with 1+1=2 and covers carrying, borrowing, and word problems.

- Multiplying and dividing positive and negative whole numbers, understanding place value, and rounding numbers.

Negative numbers and absolute values

- Understanding and using negative numbers.

- Defining the order in which operations are done in expressions.

- Understanding and finding factors and multiples. After these videos, you'll be ready for fractions.

- Understanding fractions conceptually, using operations with fractions, and converting fractions.

- Understanding decimals conceptually, using operations with decimals, rounding and estimating with decimals, and converting decimals.

- Understanding, solving, and converting percents.

Ratios and proportions (basic)

- Solving and writing ratios and proportions without algebra.

- Understanding and solving exponents without algebra.