National Council of Teachers of Mathematics
The Math Forum: Against the Odds Lesson Plan
Teachers can find ideas for their probability lesson plans here. For example, there is an interdisciplinary unit dealing with disabilities and probability as well as one using a field trip to Sea World.
National Council of Teachers of Mathematics
The Math Forum: Markdown Savings
This site from the Drexel University contains problems for practicing using percents, using a mock sale as the motif. A link takes you to a model solution.
Disfruta Las Matematicas
Disfruta Las Matematicas: Porcentajes!
This unit could be used as an introduction to percent. It has good examples.