Abstracts of 28 research reports are provided. The reports were prepared by investigators for presentation at the 56th annual meeting of the National Council of Teachers of Mathematics. A broad range of topics related to mathematics education is covered. Ten reports deal with problem solving, four are concerned with instructional methods, three with space and geometry, two with calculators, two with measurement, and two with conservation. Other papers deal with games, program evaluation, achievement prediction, perception of motion in pictures, and learning difficulties related to numeracy. (MN)