My kids love this! This is an entire unit on understanding & working with fractions. Each lesson includes an explanation, sample problems, and practice problems, as well as interactive practice for many of the lessons!
The entire unit is about 2 weeks long and uses the critically-acclaimed book, "If the World Were a Village" by David Smith. The answer key corresponds to the 2nd edition, updated in May of 2014.
-Converting between fractions, decimals, and percents
-Converting between improper fractions and mixed numbers (both directions)
There are also a multitude of links for corresponding interactive activities:
-Multiple (short) videos to watch
There is also a review of all of the topics at the end of the packet that can also be used as a quiz/test grade.