Conceptual Ruler Measurer

Sub Trajectory: Measurement

Possesses an "internal" measurement tool. Mentally moves along an object, segmenting it and counting the segments. Operates arithmetically on measures ("connected lengths"). Subdivides a unit at least into halves. Estimates with accuracy. 


You may see this:

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Other Examples:

  • Child says, "I imagine one meter stick after another along the edge of the room. That's how I estimated the room's length is 9 meters."

Help your student become a(n) Conceptual Ruler Measurer

"Guess and check" activities with initial estimates followed by measurements can help children develop an "internal sense" of a length unit and interation of that unit mentally. Also useful are real-world benchmarks for length units (e.g., floor to top of most doorknobs is about a meter).

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.