I have used a ton of useful games online:
http://www.coolmath-games.com/
http://www.quia.com/rr/36765.html
http://www.softschools.com/math/games/fractions_practice.jsp

Here are some Techy Teacher products:

http://voicethread.com/?#u3681590


<img src="http://qr.kaywa.com/?l=1&s=4&d=http%3A%2F%2Fkaywa.me%2F0vrGl" alt="QRCode"/>


http://prezi.com/jjy6ayu3faqw/lesson-35/?kw=view-jjy6ayu3faqw&rc=ref-2272389