Must have for all kind of students from elementary to Ph.D. From Primary School to Ph.D studies, concepts of arithmetic and their applications are quite important. As a foundation to Mathematics, without which we cannot imagine the modern World of science and technology, it is not what we know about arithmetic, but how we know about that is of paramount importance. The way we understood arithmetics can be either impediment or foundation to our further mathematics and other Science/Computer/Technology studies. What about just looking at the whole thing in different, amazing and more...