The purpose of this subcourse is to introduce various mathematical calculations involved in the machine shop operations of a maintenance company organization in the field. The scope of the subcourse serves to introduce the methods and procedures for solving problems involving addition, subtraction, multiplication, and division of fractions and decimals, and conversion of fractions to decimals and decimals to fractions, conversion of linear measurements from the English to the metric system and viceversa, and for solving problems using ratio, proportion, and trigonometry.