G'Day Math provides online maths courses that are short and to the point. Sections include:
- Quadratics 1: Getting Started – Playing with Numbers
- Quadratics 2: The Algebra of Quadratics
- Quadratics 3: (OPTIONAL) The General Quadratic Formula; Imaginary Solutions; Cubics?
- Quadratics 5: Fitting Quadratics to Data
- Quadratics 7: Things Missing from the Course that might Surprise Educators
The first two lectures were quite good. I was always interested in a methodical approach to finding the next number in sequence. Professor James Tanton does a good job at exampling the concepts.