APPENDIX II MATHEMATICS

The purpose of this mathematics section is twofold: first, it is a refresher for the Steelworker who has encountered a time lapse between his or her schooling in mathematics and the use of this subject in sheet metal work; second, and more important, this section applies mathematics to steelworking tasks that can not be accomplished without the correct use of mathematical equations.

The mathematics problems described in this section are examples only and are not converted into the metric system. However, if you so desire, you can convert all of the problems by using the metric conversion tables in appendix 111 of this manual. If you need more information on metrics, order The Metric System, NAVEDTRA 475-01-00-79, through your Educational Services Officer (ESO)..

LINEAR MEASUREMENT

Measurements in sheet metal are most often made in feet (ft) and inches (in.). It is necessary that a sheet metal worker know how to make computations involving feet and inches. In addition, it is necessary to become familiar with the symbols and abbreviations used to designate feet and inches, such as the following:

CHANGING INCHES TO FEET AND INCHES

To change inches to feet and inches, divide inches by 12. The quotient will be the number of feet, and the remainder will be inches.

Example:

Change 30 1/2 inches to feet and inches.

CHANGING FEET AND INCHES TO INCHES

To change feet and inches to inches, multiply the number of feet by 12 and add the number of inches. The result will be inches.

Example:

CHANGING INCHES TO FEET IN DECIMAL FORM

To change inches to feet in decimal form, divide the number of inches by 12 and carry the result to the required number of places.

Example:

Express 116 inches as feet to 2 places.

Answer: 9.67

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