Photos of icebergs from Antarctica that look so amazing you won't believe they are real! I went to "hoax-slayers" to find them. I am not sure about other searches on this site, so make sure your parents are with you since some other topics might not be suitable for fourth grade.
3 D pictures of canyons and parks in Utah. You can pan around with your mouse to look up, down, right and left. Just amazing.... make sure your seated for this one!
Song about basic shapes... square up to decagon
two web-sites for creating word searches
Free interactive site allows students to select various games to practice times tables. Diaper Derby is timed and is a good place to start!
School sponsored site. Students may compete with themselves or with others.