Here's a nice set of 48 small flash cards, 16 per page. Each mini flashcard, when folded, shows a fraction on the front. When you quiz yourself and check the answers on the back, you can see the decimal (rounded to 2 places) and percentage (rounded to the whole number) equivalents, as well as the next 2 or 3 equivalent fractions.
They're fast, and make for a great math center or kagan quiz-quiz trade activity.
There are 32 common fractions, including the halves, thirds, fourths, fifths, sixths