This issue of the journal contains abstracts and critical comments for ten published reports of research in mathematics education. The reports concern teaching probability and estimation of measurements through microcomputer games, mental addition, use of calculators at the intermediate level, logical reasoning hierarchies, two approaches to the development phase of instruction, subject matter knowledge of teachers and their classroom behaviors, verbal disagreements during small-group learning, eighth-grade achievement in the Second International Mathematics Study, high school achievement and its relationship to teaching in earlier grades, and the acquisition of basic multiplication skills. Research references from the Current Index to Journals in Education (CIJE) and Resources in Education (RIE) for January through March, 1986 are also listed. (MNS)