Math Trains Math Trains
National Geographic for Kids http://www.nationalgeographic.com/kids/
Fun activities - by girls....for girls. http://www.missoandfriends.com/
http://dep.disney.go.com/search.html?q=5th%20grade%20math%20websites&cat=0,0,0?&cmp=dep_psg_math&gclid=CIH3_9HF96oCFQFp4AodOD1_Ow
Practice with Prime Numbers Prime Number Practice
Practice with multiples using this Venn Diagram! Multiples Venn Diagram
Practice finding the Least Common Denominator with the fun game! LCD Practice
Check out the above link for a variety of math games to help you strengthen your basic skills. Math Skills Practice