This guide represents the final experimental version of an extended pilot project which was conducted in the United States between 1973 and 1976. The manner of presentation and pedagogical ideas and tools are based on the works of Georges and Frederique Papy. They are recognized as having introduced colored arrow drawings ("papygrams") and models of our numeration system (the Papy "minicomputer") into the teaching of mathematics at the elementary and secondary level in Belgium. The CSMP curriculum follows the "spiral approach." Topics covered in the first half of the text include the minicomputer and arrow pictures, decimal numbers, negative integers, multiplication, an introduction to the rational numbers and division. The second half includes several numerical games. Worksheets for the students accompany the guide. (Author/SA)