Montessori Math, Age 6-12+
- Introduction and overview of the Montessori method of teaching math to children.
- http://www.michaelolaf.net/1CW612math.html

Shu-Chen Jenny Yen's Online Montessori Albums
- 240 developmentally appropriate activities for 3-to-6 year old children.
- http://www.ux1.eiu.edu/~cfsjy/mts/_link.htm

Algebra - Mathematical abstraction from concrete experience
- An explanation of how the Montessori student learns algebra while interacting with manipulatives, physical objects, represented by expressions incorporating the numerals and variables of mathematics.
- http://www.newbanner.com/CEL/Math/algebra2.htm