Perceptual Comparer
Sub Trajectory: Comparing

Compares collections that are quite different in number (e.g., one is at least twice the number as the other). Compares collections more similar in number but only for very small numbers (1, 2, and sometimes 3). Compares collections using the number words “one” and “two".


You may see this:

Linked Image to Sign In/Sign Up page

Other Examples:

  • Shown 10 blocks and 25 blocks, points to the 25 as having more.
  • Shown groups of 2 and 4, points to the group of 4 as having more.

Help your student become a(n) Perceptual Comparer

Activities encourage children to compare quantities in different situations by perceptually judging which is more,  using terms such as  more, fewer, less, greater number, etc. Lots of everyday experiences with discussions are helpful.

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.