Early Comparer of Similar Items
Sub Trajectory: Comparing

Compares collections of 1–4 items verbally or nonverbally (“just by looking”). The items must be the same. May compare the small collections using number words “two" and “three” (approximately age 3; 2), and "three" and others (age 3; 6). Some do this even before they can accurately count by using recognition of number/subitizing for these quantities. May transfer an ordering relation from one pair of collections to another.


You may see this:

Linked Image to Sign In/Sign Up page

Other Examples:

  • A child identifies /// and /// as equal and different from // or /  / .

Help your student become a(n) Early Comparer of Similar Items

Activities ask children to compare small sets of identical objects using a range of strategies, from perceptual judgements without numbers to counting to subitizing (and if the child does not use numbers, these may be modeled by an adult, confirming the children's judgements).

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.