Learning Wave Communications
Learning Wave: Additive Property of Zero
Properties of zero are presented in detail, with a word problem that demonstrates the additive inverse property and the additive identity property of zero.
The Math League
The Math League: Whole Numbers & Basic Properties
Here is a nice resource for students and teachers about whole numbers and their basic properties. It provides links to information on place value, expanded form, and rounding numbers are just a few of the topics on this page.