It is important to develop children's mental images of numbers parallel to their acquisition of counting and calculating skills. This is achieved by various kinds of activities which reveal, in one way or the other, the underlying structures. In school mathematics numbers are closely connected with calculations, which are, in my opinion, too much emphasized. The emphasis should be shifted towards handling of numbers without calculations. The introduction of stem-and-leaf displays is a step towards that end. Being based on the fundamental idea of place value stem-and-leaf displays also help developing the children's understanding of number.
- Prof Dev