Four bulletins are presented, each addressing concerns that have arisen as teachers consider the use of calculators or begin to use calculators in their classrooms. Bulletin eight, prepared by Krist, begins with pragmatic suggestions and comments with regard to using calculators as an aid to student learning of secondary mathematics, and describes several learning activities. The ninth bulletin, by Lappan, starts with a letter to parents reagrding the benefits of calculators, and provides activities and educational games suitable for home use with pupils in grades 4-8. Bulletin ten, prepared by Thompson, provides 67 activities grouped into concept development, drill and practice, estimation, and problem solving, that can be completed in about ten minutes. Many can be developed into complete lessons. The eleventh bulletin, by Bestgen, provides 25 activities designed to aid in teaching computation with calculators at the elementary school level. (MP)