Other
Help With Fractions: Adding Fractions
The rules for adding fractions with the same or different denominators are clearly explained at this website. This is an excellent place to get step by step explanations for working with fractions.
Math Medics
S.o.s. Math: Fractions: Addition
Explains step-by-step how to add fractions. Gives examples and exercises to practice this skill.
Other
Project Happy Child: Adding Fractions Story & Worksheets
Miss Walker explains to Bart the fine details of adding fractions. At the end of the discourse is a link, "Return to Fractions index," where you can go to print off some practice sheets.
University of Cambridge
University of Cambridge: Nrich: Fractions in a Box
On this one page website sharpen your logic and fraction skills while working on this challenge. The solution is available to double check your solution.