The Older of Two Trees: Young Children's Development of Operational Time
Constance Kamii, Kelly A. Russell
págs. 6-13
Teaching Practices Associated With the Authoritative Proof Scheme
Guershon Harel, Jeffrey M. Rabin
págs. 14-19
Mathematics Skills of 17-Year-Olds in the United States: 1978 to 2004
Peter Kloosterman
págs. 20-51
Problems Dealing With Unknown Quantities and Two Different Levels of Representing Unknowns
Eugenio Filloy, Teresa Rojano, Armando Solares
págs. 52-80
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