Do "flat earthers" believe that 1 + 1 = 2 ?

None of them are willing to go on the record with this simple question.

It seems like they are fucked either way:

If they say "yes", then they believe in the basis of all science; and therefor, "the brainwashing".

If they say "no", then ... well...lol... i mean.. if they don't believe 1 + 1 = 2 ... then... lol , riiiiiiiiiiiiiiiight....