Are you smarter than a 1st grader?

Tonight Jake asked me for a little help with his homework. He had a math worksheet where he was supposed to show equations that add up to ten, represented by pictures. For example he had 3 + 7 = 10, and had drawn 3 stars + 7 stars = 10 stars. There were 8 squares to fill up on the work sheet and after he had done every combination that equaled 10, there were still 2 empty squares. I looked at the sheet and then said, "Well buddy, why don't you do 9 + 2?" He gave me a long, level look and then said in an overly patient voice, "Because that would be 11, Mom."

I know I've said by the time he was in third grade I wouldn't be able to keep up with him when it comes to math. I may have overestimated myself...