Where did that come from?

Addition. Skyler saw some flash cards and he asked if he could play with them. We told him they were math and addition and that they were for when he gets older (6 and up) but he said, "I do know math!" so we started to quiz him with easy math problems like 2 + 1, 2 + 2, 2 + 3, and he got them all right!

We don't have anything to compare it to so we don't know if other 3 year olds can do simple addition but we are very impressed with him. I say he's either a genius or he's done this before...