In an experiment using verification task procedures, 100 subjects responded to simple and
complex problems of addition and multiplication. Identical structural parameters were found …

Numbers and the ability to perform simple calculations are necessary for a wide variety of
everyday activities such as using money, telephones, calen-dars, clocks and addresses …

Three abacus-derived mental arithmetic experts were given various memory tasks. They had
a much larger digit span than the average, but their span for letters of the alphabet or fruit …

Most theories of arithmetic assume that verification tasks are performed by producing an
answer and comparing it with the presented answer. Verification is production plus …

The relationship between the elementary operations underlying the processing of numerical
information and performance on psychometrically derived ability measures defining the …

Two experiments investigated the extent to which children's mental arithmetic is constrained
by working memory rather than their arithmetical competence. A span procedure was used …

Two types of calculation processes have been distinguished in the literature: approximate
processes are supposed to rely heavily on the non-verbal quantity system, whereas exact …