How many seeds are there in a watermelon: The development of cognitive estimation skills in school-age children

Date of Completion

January 1996


Education, Educational Psychology|Psychology, Developmental|Psychology, Cognitive|Education, Curriculum and Instruction




Subjects completed the Biber Cognitive Estimation Test, a 20 item test with 5 estimation questions in each of four categories (time/duration, quantity, weight, distance/length), and the information sub-test from the WISC-III. Data from 334 British subjects in grades K-10 are presented. Data are analyzed developmentally and compared to normed adult data. Results suggest that the estimation ability shows a strong developmental trend progressing through childhood and adolescence and may in fact not be fully developed until early adulthood. Furthermore, results from the four domains suggests differences in the development of accurate estimation across domains. ^