This is the English counterpart of the Dutch RekenWeb. It started in August 2000. The goal of the Rekennet project (mathnet) is to support primary school teachers in their task to teach realistic mathematics. The rekenweb also contains an ever increasing number of computer games for children, printable activity sheets for teachers to use in classroom, practical suggestions etc. The content of the rekennet is based on the suggestions of the teachers. Thus the rekennet creates many opportunities to reach teachers and to provide them with useful ideas and materials for their daily lesson.