This workbook contains "skill sharpening" math problems presented in Spanish. These problems have been designed as supplementary work for students at the eighth grade level. Functions and topics such as addition, subtraction, division, multiplication, decimals, scientific notation (exponents), fractions, symmetry, angles, the metric weight system, and basic geometric notions are covered. Also included is a calculator unit that consists of orientation in calculator use. An introductory section describes the order in which the calculator function keys must be pressed. The main section of the workbook includes step-by-step instructions on how to add, subtract, multiply, divide, and perform other mathematical procedures. The workbook also includes a section on detailed descriptions of word problems solved with the use of a calculator. (SR)