Last week, Youngest came running up to me, clearly very excited.
"Mommy! Guess what? I can do numbers in my head. See?" He then stared intently at me for about thirty seconds, then said. "See? I can do it."
He was so proud of himself that I didn't have the heart to tell him I couldn't hear him. :) And after he left, I nearly busted a gut laughing so hard.