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. The material has been planned to help teachers meet the diverse mathematical needs of the children in fifth-grade classes. In addition to the emphasis that is always placed on arithmetic computational skills, this bulletin shows how to include other areas considered important, such as concepts, skills, and ideas from algebra and geometry. The 80 units of this bulletin are organized into three categories: sets, number, numeration; operations; and geometry and measurement. The units are sequentially planned and follow a spiral pattern. Objectives for each unit are stated. This is the first part of a two part bulletin for Grade 5. (RP)