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Activity
Purple Math

Purplemath: Converting Between Decimals, Fractions, and Percents

For Students 9th - 10th
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.
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Activity
AAA Math

Aaa Math: Converting a Fraction to a Percent

For Students 6th - 8th
The learning game has students practice converting a fraction to a percent. Participants get to see a percent score of correct answers, as well as running totals of correct and incorrect answers.
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Interactive
Doina Popovici

Math Play: Fractions, Decimals, Percents Jeopardy Game

For Students 4th - 6th
A jeopardy style game where students either playing alone or with other students can practice converting fractions to decimals, fractions to percents, and the reverse.