This article describes the beneficial effects of an intervention program, based on the computerized Origametria program and the GeoGebra environment, for acquiring geometric concepts in the second grade. Eighty-eight second-graders, from both Hebrew-speaking and Arabic-speaking schools, were instructed in groups by eighteen Hebrew and Arabic-speaking college students, respectively. The groups met for twenty-three 45-minute sessions throughout the schoolyear, undergoing different activities in Origametria and GeoGebra about the concepts of triangle, quadrilateral, square, rectangle, right angle and reflectional symmetry. The pupils' geometric knowledge was compared pre and post intervention to that of twenty-nine pupils in the control group. Pre-intervention, the experimental group's geometric knowledge was significantly lower than that of the control group and there were differences in knowledge between pupils from the Hebrew-speaking and Arabic-speaking school. Post-intervention, a considerable improvement was noted in the experimental group, to the point that group differences were no longer significant. Differences between Hebrew and Arabic-speakers in knowledge of most concepts were also eliminated. Due to the intervention program, the knowledge gap between low and high achieving pupils in the pre-intervention test was closed. Thus, all pupils were brought to a similar level of geometric knowledge. There were no gender differences pre or post-intervention.

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