You are not a computer and therefore, you cannot multitask.
As humans, people are prompted to do many things. You wake up, read the paper, prepare food, exercise, journalize, eat, and watch TV etc. There is just too much to do. However, you should consider the fact that even though you can multitask, you cannot do everything as efficiently as you can. If you focus on one task at hand, this makes you concentrate more and therefore give you presence of mind. You can also remember where you put things, if you focus. You cannot waste another ten minutes looking for the car keys, right?