That's why they're saying what is a reasonable estimate. It might be approaching 2.01, or it might be approaching 1.999. On Khan Academy, these will often be multiple choice questions, so you have to pick the most reasonable one. It would not be fair if they gave 1.999 as a choice and 2.01. But if you were saying, hey, maybe this is approaching a whole number, then two could be a reasonable estimate right over here, although it doesn't have to be two. It could be 2.01258. It might be what it is actually approaching.