The purpose of this project is to teach learning and understanding of mathematics at the ninth grade level through the use of science experiments. This part of the program contains significant amounts of material normally found in a beginning algebra class. The material should be found useful for classes in general mathematics as a preparation for enrollment in algebra the following term. In particular, the loaded beam experiment introduces negative numbers, opposites, absolute values and addition of signed numbers. The number generator experiment yields ordered pairs; when graphed, the equation of a line and its slope are determined. The falling sphere experiment gives the same kind of data but also requires the fitting of a "best" straight line. The quadratic function is approached through three experiments: the wick, horizontal metronome, and oscillating spring. Finally, the idea of tangents and slope of a curve are developed through the inclined plane, the lens, and floating magnet - with need found for translation of axes. Included in the Teacher's Commentary are background information, discussion of activities and exercises, and answers to problems. (RH)