Key points are not available for this paper at this time.
Three- to 7-year-olds' ability to calculate with whole-number, fraction, and mixed-number amounts was tested using a nonverbal task in which an amount was displayed and then hidden (J. Huttenlocher, N. C. Jordan, K. Wynn, 1995, 1997).
Mix et al. (Fri,) studied this question.