Unity 2d position of squares in different units than size.

My problem is fairly straightforward. I have one square at, say, (5,5). In my program squares are re-sized using transform.localScale to by 3 units by 3 units big. I want to have a second square that is directly to the right of the first one. So I place it at (8,5). However, it is not exactly touching the first square! What is causing this problem, an what can I do to solve it?