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What objects in this classroom are the same length as (or longer than, or shorter than) your forearm?
Which is longer, the total length of two sticks placed end-to-end vertically or the same two sticks placed end-to-end horizontally?
In Grade 1, this expectation is part of a progression of learning that develops conceptions of comparison, conservation, seriation, and iteration.
In Grade 2, students measure and estimate lengths in standard units.
Construct viable arguments and critique the reasoning of others.