This monograph provides activities for beginning algebra students to develop an understanding of the meaning and use of letter symbols, to show applications of algebra in their own lives, and to develop an understanding of mathematical processes through investigation. The activities included were developed by considering the students' mathematical knowledge, interests, maturity level, and everyday living. Several attributes of a student-centered classroom are listed. The lessons fall under four headings: (1) "Bridges from Arithmetic to Algebra"; (2) "Estimation & Conjecture"; (3) "Situational Lessons"; and (4) "Investigations." Learning materials and answers to questions in the lessons are appended. (YP)