Wolfram Research
Wolfram Math World: Euclid's Theorems
This site from MathWorld.com provides a description of the theorems of Euclid and his theories of prime and composite numbers.
The History Cat
The History Cat: Islamic Science and Math
Describes the major accomplishments of Islamic civilizations in the fields of Science and Math, i.e., the Islamic calendar, astronomy calculations, windmills, irrigation with gears, and mathematical theories.
Learning Wave Communications
Learning Wave: Commutative and Associative Properties of Multiplication
This resource provides information about the commutative and associative properties of multiplication.