Key To The New American Practical Arithmetic: Comprising Parts 2 And 3 Of The Series, For The Use Of Teachers (1877) is a book written by William Guy Peck. It is a comprehensive guide for teachers who are using the New American Practical Arithmetic series in their classrooms. The book is divided into two parts, which cover the second and third parts of the series respectively.The book provides detailed explanations and examples of the mathematical...