4*0.9r
Do I stand on a treadmill while adding them or not?
Nothing. There is no answer. I did say why the answer is nothing but I deleted the reason a few minutes ago.
What you wrote above in the mathematical world is pure rubbish. I may tell you why again later.
Anyone with a good understanding of maths would know why.
Your post
What does 2 + 2 equal?
The reason it is nothing.
Because it is not an equation. Therefore it is not a maths problem.