Simple addition

0 + 0 = ???

Bobcat's answer was 20! So let me backtrack a little. Yesterday morning we were working on a couple of math problems, keeping our skills during the summer, and we were talking about adding numbers to 0. Once you know what the answer is, it is hard to see it from the perspective of a child who is learning math for the first time! Anyway, he was kind of getting the hang of it and we finished up our little activity. Later in the evening when DH was around he heard me quizzing Anthony (4 + 0 = ?, and Anthony would say 4). During dinner DH took a turn out of the blue with 0 + 0 =, and that is when Anthony came up with 20. Still not sure why, but he was completely serious and sure that he was correct.