This is a simple and comprehensive book that will teach "Subtraction" to Kids in a fun way so that they remember what they learn for life. It's part of the "Basic Mathematics For Wise Kids" series. It was written with the help of an elementary school teacher who has several years of teaching experience. The book is large (8.5"X11" or 21.59x27.94cm), comes with matte cover and it also contains blank pages for the kid's note keeping needs. Don't forget to check the rest of the books in the series which include "Addition," "Multiplication" and "Division." Another creation of Lazaros' Blank Books for the joy of young children.