Brain Pop http://www.brainpop.com/
National Geographic for Kids http://www.nationalgeographic.com/kids/
Funbrain- educational games and activities http://www.funbrain.com
Enchanted Learning http://www.enchantedlearning.com
Education Place http://www.eduplace.com
Adding Fractions with Different Denominators http://www.helpwithfractions.com/adding-fractions-different-denominators.html
Cross Method to add fractions with unlike denominators. http://www.geocities.com/abcmcfarren/math/frac.htm
River Deep http://riverdeep.gcssd.org/lms
Fractions: addint, subtracting, multiplying, dividing http://www.geocities.com/abcmcfarren/math/frac.htm