David Eugene Smith 
Advanced Arithmetic [PDF ebook] 

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The necessity for a frequent review of the fundamental operations is recognized by all teachers, and hence the book Opens with such a review, presenting the subject in a slightly more scientific manner and introducing such short processes as are really usable in business.