This curriculum bulletin is one of a planned series of bulletins designed to meet the needs of teachers and supervisors who are working to improve the achievement level of mathematics in the schools. The eighty sequential units of this bulletin are organized into 3 categories - (1) Sets, number and numeration, (2) Operations, and (3) Geometry and measurement. A "Note to Teacher" is included in several of the units to provide further clarification of mathematical concepts connected with the unit and/or to understand reasons for the developmental material. This bulletin is designed to provide articulation with Grade 4 mathematics and with the mathematics of Grades 6, 7, and 8. This publication is the last of a four year sequence in Intermediate School Mathematics based on their philosophy of what should and can be taught in Grades 5 through 8. (RP)