A critical incident is a situation or event that holds significance for learning, both for the students and teachers. This paper presents four examples of critical incidents from a Year 7 teacher's lesson excerpts in Indonesia involving teaching of fractions, to show how they shaped classroom situation, brought forward elements of conflict, and…

Some limitations of computing with calculators and computers are described, with particular reference to typical computations which might be performed by senior secondary school students. Types of errors, the laws of number, and intermediate round-offs are each illustrated, with conclusions and implications. (MNS)

The computer simulation game "Curve-Fit" is described. Its overall objective is to fit curves to six different data sets by estimating the parameters of each curve. (MNS)

The author stresses that students need a thorough understanding of certain mathematical ideas in order to write adequate computer programs. He presents some examples using BASIC and LOGO and discusses writing programs as a mathematical exercise and using mathematics in programing. (MNS)

The actuarial profession is described to provide secondary school mathematics teachers insights into how actuaries use mathematics in solving real life problems. Examples are provided involving compound interest, the probability of dying, and inflation with computer modeling. (MDH)