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Appendix I Glossary | Up
Steelworker Volume 02 - Building manual for how to work with steel | Next
Appendix II, Continued |
APPENDIX II
MATHEMATICS
The purpose of this mathematics section is twofold:
first, it is a refresher for the Steelworker who has en-
countered 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 ac-
complished 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 informa-
tion on metrics, order The Metric System, NAVEDTRA
475-01-00-79, through your Educational Services Offi-
cer (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 involv-
ing 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:
12 inches = 1 foot; 12 in. = 1 ft; 12” = 1’
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:
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:
Answer: 9.67
CHANGING FEET TO INCHES
IN DECIMAL FORM
To change feet in decimal form to inches, multiply
the number of feet in decimal form by 12.
Example;
AII-1
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