National Council of Teachers of Mathematics
The Math Forum: The History of Zero and Place Value
This ask Dr. Math question about the history of zero and place value. Includes a very in-depth answer explaining where zero came from and how it was originally used as a place holder.
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.