Margit Revesz. The ability of calculus in incapable children and a more accurate assessment of it. Die Rechenfähigkeit der Schwachbefähigkeit und deren genauere Wertung.—Zeitschr. f. d. Erforschung und Behandlung d. jugendlichen Schwachsinns, B. II, 1908

It is not difficult to draw a line between average normal children and retarded children who require placement in a special school for retarded children. It is much more difficult to divide into groups of children recognized as retarded. The author, on the basis of studies of retarded children in an auxiliary school in Budapest, believes that mathematical exercises, oral and written, in the four rules of arithmetic can serve as a convenient criterion in this regard. This takes into account both the ability of numeration, the speed of decision and the quality of work. Using this method, retarded children can be divided into three categories: quite successful, average and weak.