These sites help students visualize what large numbers, such as one million, look like. There are online representations of a million, plus hands-on activities. Find out your age in millions of seconds. Includes lesson plans about the books by David Schwartz. There is a link to an eThemes Resource on place value.
This site helps you visualize what a million and a billion pennies look like. Click on "Enter the MegaPenny Project" to advance through the pages in order, or use the links at the bottom to skip to a particular number. Don't miss the "MegaMoo" link that lets you see what a million cows looks like.