He answered that he was going into the fifth grade, because he is going to be five years old!
Well, it makes a lot of sense!
That reminds me of the scene in Beverly Cleary's Ramona the Pest, when Ramona went to school by herself for the first time. Her mother told her to leave the house at a quarter after eight.
Ramona knew that a quarter is 25 cents, so a quarter after eight must be 25 minutes after eight.
And, come to think of it, my nephew is about the same age as Ramona was in the book!
