While testing was done on 5- or 6-year-old children ("Take a Number: Kids show math insights without instruction," SN: 6/2/07, p. 341), it would be interesting to see if this intuitive skill persists after these students are exposed to standard mathematical instruction in the higher grades. I suspect that the answer will be no, as students restricted to a method of learning math will be deprived of this original ability.
Silver Spring, Md.
The pictorial examples presented suggest a possible problem with the design of the study or the need for a reinterpretation of the results. In both examples, the correct answer corresponds to the picture of Sarah, who has two bags above her image. Two bags would correspond to "more" in most kids' minds, regardless of the numerical labeling and mathematical operation depicted and whether or not the kids can understand numerical and mathemat