Not too long ago, on a visit to two sixth-grade classrooms, the author saw very clearly the challenge teachers have before them when they try to differentiate reading. In both classrooms, 11-year-olds who read like fourth graders shared tables with classmates who read like the average ninth grader--a five-year span. How teachers approach this challenge can make a huge difference for all levels of readers. In this article, the author answers ten teachers' questions on how to differentiate reading instruction.