Check out these sites:
Visualize a Fraction:
http://www.webmath.com/k8if.html
Identifying Fractions:
http://www.visualfractions.com/EnterCircle.html
Comparing Fractions:
Explanation:
http://www.visualfractions.com/Investigate/Compare/Compareframes.htm
Exercises:
http://www.visualfractions.com/CompCircle.html
http://nlvm.usu.edu/en/nav/frames_asid_105_g_2_t_1.html
Reducing Fractions:
http://www.visualfractions.com/LowestCircle.html
Equivalent Fractions:
http://www.learningplanet.com/sam/ff/index.asp
