Some background information and guidelines on computer generation of random numbers is presented. Sections concern ways of generating random numbers and descriptions of statistical tests. (MNS)

Fractal geometry is explored, with sections on snowflakes and flow snakes, Mandelbrot's definition of fractal, and other fractals. (MNS)

How the manipulative aid called the "10 frame" can be used to teach the number combinations for 10, the addition facts that bridge 10, and the place value nature of our number system is described. (MNS)

Some strategies for avoiding misconceptions about the greatest common factor and the least common multiple are presented. Several alternative methods for computing each are given. (MNS)

Research on college students' ability to estimate means and variances for sets of data showed that they were more able to estimate means, and that various characteristics of the data (e.g. magnitude of numbers) influenced the accuracy of estimates. (SD)

This article suggests some criteria to consider when using a concrete representation to support the treatment of a mathematical concept or sentence. (DT)

A method of using a diagram to investigate properties of fractions is described. (DT)

A divisibility test for the number 7 is analyzed, and the general method is considered for other numbers. (DT)

A puzzle concerning whole numbers is analyzed and extended to different number bases. (DT)

A method for changing repeating decimals to fractions is explained. (DT)

A BASIC computer program is provided for producing the base ten digits of the known Mersenne primes and their associated perfect numbers. (DT)

The problem of zero divided by zero is discussed. (DT)