This PowerPoint has nice graphics, clean transitions and animations, and plenty of examples! It would fit well with any 4th math curriculum that includes equivalent fractions! I used it with the 4th Grade GO MATH series!
Introduction: Fraction Review
Part 1 Equivalent Fractions with models
Part 2 Equivalent Fractions using multiplication (includes cross-multiplication method)
There are a total of 71 slides in all.
I also have this PowerPoint with a Thanksgiving theme!