Please describe one of the stages of development of mathematical thinking about length according to Barrett and his colleagues

What will be an ideal response?


According to Barrett and colleagues, the levels of development of mathematical thinking about length are as follows:

a. Level One: the students used wild guessing, often without a unit
b. Level Two: the students use lines, dots on hash marks to divide up a linear space, but the lines weren't necessarily equally apart. The may count has marks or lines even though they represent uneven lengths.
c. Level Three: These students use a conceptual ruler in their mind to divide up a line into roughly equal segments. They can find a perimeter of many sides.

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