This model helps to visually represent finding a part of a part. It is often introduced with story problems like this: Stephen eats 34 of a brownie pan that has only 25 left. What fraction of the whole brownie pan does Stephen eat?
Math Skill: Fractions. What I like the most about this site is that the pennants are able to be cut out and colored. I like that they can be hung up around the room for students to look at if maybe they're feeling stuck.