My guess for 1 + 1 is... uh... 11. But that's just a guess.
Side story: When my brother and I were pre-teens, we shared a bedroom and nightly philosophical discussions. One of those discussions was about what to "call" various dates in history. For example, we wondered, what would we "call" the year 2001? Would it be "two thousand and one" or would it be "twenty-oh-one?"
I asked my older and wiser brother (he is 10 1/2 months older than I), "What do you think they called the year "one-one-one-one (1111)? Did they call it 'one thousand one hundred eleven; or did they call it 'eleven eleven'?"
He thought for a moment and then came up with the definitive answer: "They called it 'one-teen-oney (pronounced wunny) one!'" ;-)
Ya know... I think he may be right.