Adaptive teachers use student data to guide instruction. Learn about using an anecdotal record form to support adaptive teaching. In this article, the authors describe how teachers can use learning trajectories to make adaptive decisions to meet the needs of their students. They provide an example using the U .S. Math Recovery Council's learning trajectories and sub-goals for addition and subtraction to 100. The authors offer concrete tools and suggestions for how teachers can elicit, record, and interpret student thinking using learning trajectories to adapt their instruction to meet the needs of the students in their classes.