## TOC

- Early math
- Arithmetic
- Pre-algebra
- Algebra I
- Geometry
- Algebra II
- Trigonometry
- Precalculus
- Statistics & probability
- Calculus
- AP Calculus AB
- AP Calculus BC
- Differential equations
- Linear algebra

## Concepts

### Early math + Arithmetic

*Picture from Wikipedia*

- counting
- number, 2-digit number, 3-digit number
- Elementary arithmetic: addition, subtraction, multiplication, division, regrouping (carring, borrowing), times tables, basic facts, quotient, remainder
- Deci- (or places): tens, hundreds; tenth, hundredth
- Geometry: size, size length, conner; shapes, fractions of shapes, composing shapes
- Basic Facts: In Basic Facts, the arithmetic operations such as addition, subtraction, multiplication, and division are performed mainly by using the one-digit numbers (1 to 9).
- negative number, positive number, opposite number, absolute value
- fraction (To be continued from https://www.khanacademy.org/math/arithmetic-home - Fraction)

## Long Long After

- cartesian coordinate system, polar coordinate system