#
Arithmetic and pre-algebra
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. This topic includes videos from the former developmental math playlists.

## Subtopics

- Addition and subtraction Addition and subtraction
- Multiplication and division Multiplication and division
- Factors and multiples Factors and multiples
- Negative numbers and absolute value Negative numbers and absolute value
- Decimals Decimals
- Fractions Fractions
- Ratios, proportions, units and rates Ratios, proportions, units and rates
- Applying mathematical reasoning Applying mathematical reasoning
- Exponents, radicals, and scientific notation Exponents, radicals, and scientific notation
- Arithmetic properties Arithmetic properties
- Telling time Telling time