These are games from earlier in the year:

Matching Decimals and Fractions:  http://www.bschool.com/activity/match_fractions_decimals/

Fruit Splat:  http://www.sheppardsoftware.com/mathgames/fractions/FractionsToDecimals.htm 

Converting Fractions to Decimals:  http://www.mathplayground.com/fractions_convert.html

Death to Decimals:   http://mrnussbaum.com/deathdecimals/

Decimals and Percents: http://www.math-play.com/Decimals-and-Percents/Decimals-and-Percents.html

Fraction and Percent Matching: http://www.math-play.com/changing-fractions-to-percents.html

Fraction and Percent Matching: http://www.mathplayground.com/matching_fraction_percent.html

Percents as Fractions and Decimals: http://www.helpingwithmath.com/resources/games/fraction_game5/frac_percent_dec01.html

Wise Park: http://kidsmathgamesonline.com/numbers/percentages.html

NEW GAMES ADDED:

Wise Park: Percentages on a hundredths grid

Who Wants to Become a Hundredaire: Converting between percents, fractions and decimals millionaire game 

Converting between percents, fractions and decimals 

Matching game with percents, fractions and decimals

Jeopardy: Converting between percents, fractions and decimals jeopardy game

Converting between percents, fractions and decimals multiple choice

Converting between percents, fractions and decimals memory 

Converting between percents, fractions and decimals memory

Find whole given percent and part

Find part given percent and whole