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Virtual laboratories are increasing for all areas of scientific domains. However, the concept of such laboratories can be extended to include educational activities. But the point is, how to do it? We have been involved in the development of a virtual laboratory on mathematics education for the past 15 months. Our institution is involved in the training of primary school teachers. On their final year, our students go to primary schools and teach there in some supervised classes. Our idea is to create an instrument that can be used with primary school children by our students, during the earlier-mentioned practice in schools. Therefore it has to be an instrument with features that include being appealing to children, easy to use, and helpful to novice primary school teachers.