This study examined the extent to which teaching practices and teaching experience predict mathematics skills of children's in the third through fifth grade by focusing on three cognitive components: (1) knowing facts and procedures, (2) applying this knowledge and (3) using reasoning. This study was longitudinal. The data was collected from 1,810…

D. Elkonin's thesis that thinking is much more closely related to writing than to oral speech formed the basis of our three-year formative experiment at the elementary school level. In order to test this idea, second-graders through fourth-graders were given a few assignments in which they were asked to exchange thoughts in writing with their…