This is a free program taken from a CD-ROM collection of over 200 mathematics puzzles, available on the developer's Web site. Developed by a veteran teacher, these visually-oriented puzzle games have a simple interface and are designed to provide math problems in context to middle-school (grades five through nine) students.
In this particular program, students locate points on a number line. Problems deal with fractions, decimals, square roots, and/or absolute values. You can view a screenshot of this program by clicking here.