Spatial Extent Estimator—Small/Big

Sub Trajectory: Numerosity Estimation

Estimates which set is more or less if the differences are clear (e.g., one is double the other).  Names a "small number" (e.g. from 1-4) for sets that cover little space and a "big number" (10-20 or more) for sets that cover a lot of space. Children classify numbers "little"/"big" idiosyncratically, and this may change with the size of the to-be-estimated objects.  


You may see this:

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Other Examples:

  • A child is shown 13 objects spread out for 1 second. When asked, "How many?", the child responds, "Thirty!"

Help your student become a(n) Spatial Extent Estimator—Small/Big

Activities ask children to make simple perceptual estimations about which set has more, including comparison of some larger numbers, but only when comparing sets (e.g., 8) covering a small area to a much larger set (e.g., 16 or more) covering a larger area. Initially these differences can be quite obvious, then decrease them as children gain competence.

Special Thanks To

Institute of Education Sciences
The research reported here was supported by the Institute of Education Sciences, U.S. Department of Education, through grant numbers R305K050157, R305A120813, R305A110188, and R305A150243. to the University of Denver. The opinions expressed are those of the authors and do not represent views of the Institute or the U.S. Department of Education.