I remember sitting there stunned while my then barely 4 year old DD was taking a placement test for math. I didn't even think she knew what to do with a two-digit addition problem, but when faced with the question of 17+8= ? and was given the answer choices of a)14, b)20, c)9, d)25 .... she selected d)25. I asked her how she knew that answer, and all she could say was, "It is the right one". I asked if she added them in her head, and she looked confused, then said to me,"well it could not be 9 or 14 'cause they are smaller than 17, and well 25 is just the right one"

Our days have been filled with this ever since then.