The primary source of all mathematics are integers
Herman Minkowski
God made the integers. The rest are man thing
agree with it. Humans in general we think it is somewhat counterintuitive in fractions or even less intuitive in irrational numbers like pi or square root of 2. I remember when an aunt tried to teach his daughter the result of dividing 5 by 2. Then my aunt began to despair because my cousin was not the result. Maybe my cousin had been simply the result of failure to submit the pressure of his mother, but that does not change the fact that the most natural thing in the world is to see things whole. There is a book, two books ... do not say there are half a book, three quarters of Pi book or books, except that we cut the book, which would be tragedy (unless the book is about astrology or any related maguferÃa).
But yes, above we see that a book can not be presented in fractional form, although it is well if we look at one of the pages of a book. Although we do not consider whether the book has a total of 237 pages, a page is 1 / 237 of the book, we think the page as a unit itself.