What is double plus one and double minus one mean?

82 and why would you ask such a stupid question??

If you mean: 10^2 x 2 + 1 I got : 201

-8

1 plus 1 = 2 because 1 thing and another thing is 2 thingsthink abstract; like (example) 1 sandpile + 1 sandpile = 1 sandpile. Or 1 glass of water plus one glass of water = 1 bigger glass of water.

no