Ruth Ann Duncan is a teacher from National City Middle School in National City, California. She assigned a problem to her class that is similar to the one you have just worked on.

In the video segment at left (duration 6:19), you can watch Ms. Duncan's seventh- and eighth-grade students grapple with this problem. As you watch, think about how the students are approaching the problem. Do Ms. Duncan and the students reflect your criteria for effective problem solving?

  Think about the classroom