Christopher Sarlo has been a teacher of mathematics for more than 17 years. He has facilitated honors level elementary classes, as well as serving as an RTI (Response to Intervention) math teacher. Mr. Sarlo has taught mathematics in grades 3- 6 and is currently a fifth grade teacher on Long Island, NY. Outside of his classroom work, he is a curriculum designer, and writer who has helped numerous Long Island school districts with lesson alignment and implementation of Common Core curricula. Mr. Sarlo was a member of the writing team responsible for creating NY State’s official “math modules” curriculum “A Story of Units”, and participated in the Common Core Exemplar Writing Project. In addition or curriculum writing, Mr. Sarlo has prepared and facilitated numerous faculty workshops and professional development sessions including break-out sessions at the Nassau County Association of Math Supervisors annual How to Make Math Count conference, the New York City Math Project annual Teaching Mathematics conference and the National Council of Teachers of Mathematics Regional and National conferences. The “Thinking Math Differently” series is Mr. Sarlo’s first publication.