These two bulletins were developed for the Calculator Information Center. "Motivating Activities for Low (and Higher) Achievers," prepared by Don Miller, presents activities that suggest ways in which a calculator can be used to help reinforce or develop certain mathematical ideas. Included are sections with activities for numeration, mental computation, number patterns, estimation, and problem solving. "Solve It with a Calculator," prepared by Earl Ockenga and Joan Duea, focuses on experiences for using the calculator to develop skill in solving problems. The problems have been selected to appeal to various ages and abilities. Students may use such strategies as make a guess and check, choose the operation, or look for the pattern. (MNS)