Tom brought home his whiteboard from work and left it in the living by room. He walked by later to see this—Owen had completed a bunch of addition problems:

By the time I got home, he had done more:
He kept adding sums…and did them all in his head. Once I started going through them (which I told him I had to do for it count as his nightly math homework), there were a few errors, but really still impressive. I’m not sure if you can see it, but he went all the way up to 16001664 + 16001664 = 32003128 + 32003128 (which wasn’t the right answer but it was close).
Sometimes he just blows our minds.