Wallpaper is presented as a source for problems and activities involving geometry, statistics, measurement, and estimation. Sample questions and examples are discussed. (MP)

Calculation of the percentage of work completed when the edges of jigsaw puzzles have been assembled provides interesting problems. (SD)

An activity unit is described that helps children recognize the inside and outside of closed curves. (MP)

Planned experiences for exploration of materials are suggested for introducing geometric concepts. Examples discussed include motion, symmetry, and shape. (MP)

Activities are presented that permit students to gain firsthand experiences with ideas about two-dimensional and three-dimensional shapes and volume that textbook exercises rarely provide. (MP)

Worksheets are presented by grade level that give practice in comparing and measuring areas. (MP)

Preservice elementary teachers were given the task of showing a special case of the Pythagorean theorem by paper cutting. In the process they developed approximations to the square root of two. (SD)

Four worksheets on geometry are given. Experiences in identifying and constructing described shapes, drawing congruent polygons, and visualizing the shapes needed to build hexagons are included. (MNS)

Six different methods were used by students to solve the problem of finding the area of a given trapezoid. A seventh method used by textbooks is also discussed. (MP)

Describes an activity approach for teaching upper elementary school students the concept of angles. In the interdisciplinary activity, students practice reading and drawing angles from 0 to 360 degrees as they simulate the behaviors used to navigate a sailboat. Includes list of equipment needed and procedures used. (JN)

Lists three guidelines for the sound use of manipulatives in teaching geometry. Also describes activities that use manipulatives to teach topics in geometry and measurement and which illustrate the application of the three guidelines. (JN)

Geoboards are viewed as excellent vehicles for developing intuitive understandings of various topics in transformational geometry. The activities described are designed to show pupils that when a triangle or parallelogram is subjected to a transformation called a shear, its area is not changed. Ways for finding areas are detailed. (MP)

Having students find and cut out of graph paper the 12 pentominoes can provide an enjoyable exercise in perception, discovery, and double checking. The pentominoes can then be used to illustrate informally several geometric concepts. (SD)

A number of paper-folding activities are described. The activities illustrate geometric concepts, theorems, and construction techniques. (SD)

This game uses attribute blocks to encourage the formation of problem-solving strategies, provide drill in the addition of randomly generated numbers, and aid in pupil recognition of pictorial representations of geometric shapes. The material is based on the psychological principles common to other attribute games. (MP)