This paper reports on a mixed methods study of 111 AP calculus students' self-reports of their graphing calculator use, comfort, and rationale when choosing between mathematical solutions produced with and without a graphing calculator. [For the complete proceedings, see ED585874.]

Noise in the form of random errors arising from choices is a common problem. Examined three different approaches for coping with noise. Found that reciprocity works, provided it is accompanied by generosity or contrition. Changing one's choice after a poor outcome was not seen as helpful. Other points are discussed. (RJM)

This document contains the fifth volume of the proceedings of the 30th Conference of the International Group for the Psychology of Mathematics Education. Conference presentations are centered around the theme "Mathematics at the Centre." This volume features 59 research reports by presenters with last names beginning between Sac and Zaz:…