Adding and subtracting fractions
http://www.math.com/school/subject1/lessons/S1U4L3GL.html
How to add and subtract fraction
http://cne.gmu.edu/modules/dau/algebra/fractions/frac3_frm.html
Fraction Addition and Subtraction
http://www.lessontutor.com/sv1.html
Adding and Subtracting Fractions
http://www.orchardproject.org/adding_and_subtracting_fractions.htm
Adding and Subtracting Fractions
http://www.jamit.com.au/htmlFolder/FRAC1007.html
Basic Math Fractions Addition & Subtraction
http://www.telacommunications.com/misc/games/mathquiz/fract01.htm
The Learning Equation Math Adding and Subtracting Fractions (Like Denominators)
http://argyll.epsb.ca/jreed/math8/strand1/1202.htm
Fraction Shoot out
http://www.funbrain.com/fractop/
The Learning Equation Math Adding Fractions with Unlike Denominators
http://argyll.epsb.ca/jreed/math8/strand1/1203.htm