This book teaches children to add the numbers 1 and 2. Through tracing and reciting simple numbers first, and then gradually shifting to addition using the numbers 1 and 2, children grasp the concept of basic addition without difficulty or anxiety.
Goes deep on the 'counting up' method, and I get that repetition is necessary for memorization. The topic is the right one, but I can't help but think the authors were a little bit lazy en the execution whereby half of the book is just math problems over and over. This ended up being the subway book, but feels like a weaker link in the Kumon series.