A survey of what items of equipment are considered useful in teaching mathematics by secondary school teachers is presented. (JP)

A presentation of learning experiences involving materials is recommended which reflects the sequence of the developmental stages. This sequence is concrete, concrete-abstract, pictorial-abstract, and abstract. Instructional examples at each level are presented. (JP)

Compared were the effects of two-dimensional and three-dimensional instructional materials on the learning of 88 educable mentally retarded students with chronological ages between 11 and 16 years. (Author/DB)

Materials for sorting, counting, and number activities are listed, with sources. This is the third of a series in a revision of a materials list given in issue No. 40; earlier lists in the revision appeared in issues No. 58 and 59. (DT)

Specific mathematics lab activities involving fractions and measurement at the seventh grade level are described. (DT)

Measuring activities using the metric system are suggested for the elementary level. (DT)

Described is a physical realization of the Klein four-group which shows the isomorphism of the symmetry group of the rectangle and Piaget's INRC group of logical implications. (MM)

Author relates how disinterested students sent to his art class developed a renewed interest in school as a direct result of their experiences with clay. (NP)

How to use student manipulative materials and the overhead to get student involvement with first graders. (RB)

Notes on jeep trips and card stacks; some work with Multibase Arithmetic Blocks, the complex roots of unity, and a divisibility test. (MM)