Tenoch E. Cedillo A.* (Mexico), tcedillo@ilce.edu.mx
A number-based approach to introductory algebra: A study with 11-12 year
   olds using graphic calculators

Research results obtained from using graphic calculators as mediating tools to
help novice students express and justify generalisations are addressed.  The
study was carried out in different stages and school settings. In 1994-96
within a highly framed classroom environment, with 25 students and the
researcher playing the role of the teacher. In 1997 the investigation
continued, a real full-time teacher with a class of 40 students was in charge
of the classroom and the researcher only observed and analysed the classroom
work. Finally, in 1998, the research involved 18 middle schools throughout the
country, around 100 teachers and 10000 students took part.