Primary Resources
Primary Resources: Fractions, Decimals, and Percentages
A large collection of teacher resources dealing with fractions, decimals, and percentages at many different levels. There are worksheets, PowerPoints, smartboard presentations, Word, and pdf files for the teacher's use.
Purple Math
Purplemath: Converting Between Decimals, Fractions, and Percents
Scroll down to just below the middle of the lesson for an in-depth lesson on converting fractions to percents. Works through numerous examples step by step and shows what happens when the "decimal expansion" doesn't end when converting.
Help Algebra
Help algebra.com: Percents
Converting percents to and from decimals and fractions is demonstrated in detailed examples. Once the concept is understood, you can use it to solve equations that contain percents.