Conceptua Math is a site containing free web tools to support teaching and learning about fractions. These tools are designed for teacher-facilitated instruction, and include sample problems to give teachers instructional suggestions. For each tool you will find a short instructional video, standards alignment, key vocabulary, and IEP goals.
More about this material
Nancy Tierney (Student)
I have the impression that this is meant for teacher led practice. However, it does not grab the students' attention. I find that a piece of colored paper or paper plate work great as a model. I was also disappointed to find that the teacher had to buy a subscription to use the tool.