Level 2: Transitive comparison (3 or more objects)
Ordering the comparative size of three or more objects relies on using the transitive property of measuring quantities. That is, if the yellow striped pencil is longer than the red pencil, and the red pencil is longer than the stubby yellow pencil, then the yellow striped pencil is longer than the stubby yellow pencil.
Direct comparison and ordering of length (transitivity).
At Level 2 students can also make a copy of one object, say with their fingers, and use it to compare to another object.