This 12-week study examined attitudes and performance of 187 preservice elementary teachers on computational estimation and evaluated practice with and without instruction on specific mental estimation strategies. Analysis showed significant differences in estimation performance in favor of the groups receiving regular practice. (MK)

An approach to the teaching of steady-state recycle calculations is presented. Included are the solutions to two sample problems. (BB)

The author recommends allowing elementary students to use pocket calculators, so that they may concentrate on the sense of a math problem without getting bogged down in computation. He presents calculator activities on place value, estimation, and arithmetic operations, suitable for grades 1-6. (SJL)

The author argues that one answer to the criticism that the variation in demographic composition of the labor force leads to misinterpretations of unemployment statistics is to display the time series of unemployment rates for various demographic groups. (BM)

The results of various attempts to quantify how much changes in the labor force, unemployment insurance, and minimum wages have affected unemployment rates are reasonably close; but no total effect on jobless rates can be determined. (BM)

An experimental program using the calculator in third, fourth, and fifth grades is described. Three example lessons are included, on (1) subtraction with regrouping, (2) estimation, and (3) number theory: Quadratics. (MK)

Examples given for uses for the calculator exchange key include: generation of the Fibonacci sequence and geometric series, determination of square roots, and the chief use of the function, which is to interchange the numerator and denominator of a fraction. (MK)

Describes a study of the relationship between performance on word problems and general reading ability, certain problem-solving reading and thinking skills, and computation skills. (DD)

Samples of children in English secondary schools were given a test on integers, as part of the investigation into children's understanding of mathematics undertaken by the Concepts in Secondary Mathematics and Science (CSMS) project. This is a brief report of the performance of the third-year children. (Author/MK)

Noitcarf numbers provide a simulation activity that allows teachers or education students to gain an understanding of the feelings of students who are taught mathematics by a "rules" method. They are actually an abstract presentation of operations with fractions. (MK)

Background material related to this controversy discusses four points of view and moves to an examination of Turing's formulation of the question. (MP)

The author discusses the effect of the electronic hand calculator on mathematics classes. The calculator motivates students to learn and time previously spent on computations may be used to stress functions, but students have to be reminded that calculators will not do their thinking. (MF)

This study recalculates outdated values for thermochemical radii using more reliable and elaborate calculations of lattice energy and recently obtained ancillary thermodynamic data. (BT)

Presents a derivation which yields a general relationship between the relaxation time, and equilibrium concentrations and rate constants. (BT)

A set of recommendations from a group of mathematics and science professional associations are presented for essential and desirable features in calculators for use by pupils in secondary schools. (MP)