Utilizing word problems relevant to the field of environmental health, this workbook presents a concept-oriented approach to competency development in 14 areas of basic mathematics: (1) the expression of numbers as figures and words; (2) the addition, subtraction, multiplication, and division of whole numbers, fractions, and decimals; (3) scientific notation; (4) ratios and proportions; (5) percents; (6) measurement; (7) the geometric concepts of perimeter, area, and volume; (8) the Pythagorean Theorem; (9) introductory trigonometry; (10) introductory algebra; (11) problem solving; (12) logarithms; (13) probability and statistics; and (14) graphs. For each competency area, the workbook presents a series of word problems designed to reinforce student learning and to demonstrate the practical applicability of the mathematical concepts to the situations faced in environmental health occupations. An answer key for the problems is appended. (JP)