The Bring It On! Fractions ebook is designed specifically for this task. This eBook gives daily practice with finding equivalent fractions, simplifying, adding and subtracting fractions, converting fractions form improper to mixed numbers, multiplying by whole numbers and converting to decimals. It is a great strengthener with knowing and using fractions.
Once students understand fractions and what they are (if not read this Fractions FAQ), the next step is to have students use them regularly so that the concepts are not lost. Use it or lose it!
Another excellent tool is the Fraction Games eBook. This book presents dominoes and a full deck of cards linking the relationships between fractions, decimals, percentages and the pictorial representation.