I was recently planning to teach my friend Ruth Cossey’s elementary math methods class at Mills College in Oakland, California. Digging through my collection of student work, I found a paper from a third grader I had interviewed. When doing interviews, I typically ask students to figure out answers in their heads, but I agreed when Nomar asked for paper and pencil for some of the problems.
Place value is one of the most important foundational concepts about our number system. Watch my assessment interviews of second graders and learn how you can find out what your students understand about place value.