The need to include proficiency with estimation and mental arithmetic as goals for the study of computation is presented. Approaches and guidelines are described for developing these skills.

Describes the method to solve problems called T-E-M-T-T: trial, error, and modified trial through technology. The method integrates students' skills of estimation, mental computation, and appropriate choice of calculator use. Includes 2 activities for each of grades K-4 and 5-8 that illustrate the method. (MDH)

Presents five activities focusing on mental computation and estimation for the K-3, 3-5, 4-6, and 6-8 grade levels that require the student, acting as a judge, to review solutions to problems and to pronounce and justify a verdict. Provides suggested materials, questions, possible extensions, answers, and worksheets for each activity. (MDH)

Front-end estimation is discussed, with several examples, teaching tips, testing tips, and some references on research and additional activities. (MNS)

The focus is on suggestions for teaching rounding wisely as an estimation strategy. (MNS)

Ideas are given on how to teach children to make estimates in measurement. (MNS)

Activities on estimation and mental computation are presented. Patterns on a hundred chart, an amazing fact, teaching and testing tips, and other references are included. (MNS)

Use of compatible numbers resulting in easy mental computations is described, along with related teaching and testing tips. (MNS)

Problems based on shopping experiences are presented on two posters. Children practice estimation and computation with addition and subtraction. (MNS)

The NCTM Standards regarding whole number computation and computation and estimation are reviewed and explored. Activities for implementing this portion of the Standards in grades K-4 and 5-8 are suggested. (CW)

Four worksheets are included, providing practice in estimation, computation, pattern recognition, and problem solving involving calculator use. (MNS)

Computational skills in multiplication and division are reinforced and practice is provided on these worksheets on estimating, finding factors, and determining divisibility. (MNS)

This section contains four worksheets for games on estimation. Impact, Crossfire, Fire One, and Fire Two each require the use of calculators to focus on place value, multiplication, or division. (MNS)

Three worksheets are given that use calculators to free students from computational restrictions and allow them to focus on the recognition of patterns and the application of numeration concepts in the development of their estimation skills. (MNS)

Parents can encourage their children to become better mathematical thinkers. The article describes how to assist children with problem solving and presents activities that develop specific skills (estimating, counting, sorting, volume, fractions, multiplication, money, story problems, patterning, averaging, computation, magic squares, plane…