This student manual is concerned with the practical application of mathematics as used by masons. The manual's design allows students to work at their own pace. Included in each of the five units are individual lesson sheets with written instructions and explanations. Each information sheet states that topic's objectives, information about the topic, examples of procedures, and problems for the student to solve. Unit 1, decimal fractions, contains problems in addition, subtraction, multiplication, division, decimals on the electronic calculator, percents to decimals, fraction equivalents, and multiplication and divison by percents. Unit 2 contains problems on rounding off numbers. Unit 3, fractions, contains problems in addition, adding fractions on the calculator, dimensions-addition, adding dimensions on the calculator, converting fractional part of a foot to inches, subtraction of fractional dimensions, subtraction of dimensions on the calculator, and multiplication and division of fractions. Unit 4, square measure, contains problems concerning areas and perimeters of squares, rectangles, triangles, and circles; areas of walls and ceilings; and areas of solid geometric figures. Unit 5, cubic measure, contains problems in computing volumes of cubes, rectangular prisms, and walls; quantities of materials (brick, mortar, stone); footings; volumes of cylinders and triangular prisms; and the cubic yards of concrete floors, walks, and patios. Unit tests are provided at the end of the manual (answers are not provided). (CT)