DH and I realized, within a day or two of each other, that DD 3 yrs 2 mos knows simple addition and subtraction.

I asked, "If you have two apples and one orange, how many pieces of fruit do you have? What if you also get a banana, then how many?" She got all my little questions correct.

DH told her a bed time story about five magic jumping beans. While describing in great detail people eating a bean and having some big adventure, he paused to ask, "Do you know how many beans were left?" DD said, "Two! Who's going to get them Daddy?"

We're surprised because we have not attempted addition and subtraction at home before.