This research brief describes the value of using mobile technologies in and out of elementary mathematics classrooms, and investigates the view that teachers may not be getting the guidance they need to best leverage those technologies. The authors explore three areas of concern: How can teachers use technology in developmentally appropriate ways to facilitate mathematics learning? What strategies can they use to integrate technology into the classroom in ways that allow students to successfully understand the mathematical content being taught? How can one select the appropriate technology tools to best foster the learning of mathematics concepts and practices?