This document contains the proceedings of the 25th annual conference of the Mathematics Education Research Group of Australia (MERGA) held at the University of Auckland, New Zealand. The focus of this meeting is mathematics education in the South Pacific. Presentations are centered around the topic of numeracy in primary or elementary school. Papers include: (1) "A Samoan Perspective on Pacific Mathematics Education" (Karoline Afamasaga Fuata'i); (2) "The Process of Introducing New Tasks Using Dynamic Geometry into the Teaching of Mathematics" (Colette Laborde); (3) "Effectiveness and Efficiency of Calculator Use for Computation in Years 8-10" (Jack Bana and Rachel Shipley); (4) "A Problem-Based Schema Analysis in Algebra" (Mohan Chinnappan); (5) "An Investigation of Disjuncture between Graphing in School Mathematics and School Physics" (Patricia A. Forster); (6) "Single or Combination Grades in Mathematics in the Early Years" (Marj Horne); (7) "A Model for Teaching Numeracy Strategies" (Peter Hughes); (8) "Teacher Development for Inquiry Based Instructional Practice in Mathematics: A Poststructuralist Postscript" (Mary Klein); (9) "Patterns of Misperceptions in Linear Transformations: Four Illustrations" (Martin Lamb, Sam Leong, and John Malone); (10) "Common Errors in Mental Computations of Students in Grades 3-10" (Alistair McIntosh); (11) "Rethinking Curriculum: An Ethical Perspective" (Jim Neyland); (12) "Monitoring Effective Use of Computer Algebra Systems" (Robyn Pierce and Kaye Stacey); (13) "Professional Development of Teachers of Mathematics through Extended Collegial Dialogue: The ACT Mathematics Quality Teacher Program" (Steve Thornton and Kerrie Blain); and (14) "Validation of the New Zealand Number Framework" (Jenny Young-Loveridge and Vince Wright). The second volume also includes 22 short communications. (KHR)