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Which is more, 3 small cookies or 2 big cookies? What makes this difficult to answer?
Attend to precision.
Other than counting, how might you decide whether one set has more objects than another?
In kindergarten, this expectation is key to several progressions of learning: (a) from counting to counting on and (b) from comparison by matching to comparison by numbers to comparison involving adding and subtracting.
Construct viable arguments and critique the reasoning of others.