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;

Change 26.5 feet to inches.

ADDITION OF FEET AND INCHES

A sheet metal worker often finds it necessary to combine or subtract certain dimensions which are given in feet and inches.

Arrange in columns of feet and inches and add separately. If the answer in the inches column is more than 12, change to feet and inches and combine feet.

Example:

In the changing inches column, we have

SUBTRACTION OF FEET AND INCHES

Arrange in columns with the number to be subtracted below the other number. If the inches in the lower number is greater, borrow 1 foot (12 in.) from the feet column in the upper number.

Subtract as in any other problem.

Example:

Subtract 2' 8 1/4" from 4' 1 ".

MULTIPLICATION OF FEET AND INCHES

A sheet metal worker maybe required to determine the total length of metal required to make eight pieces of duct 1' 8" long. To do this, you should be able to multiply feet and inches by the number of pieces.

Arrange in columns. Multiply each column by the required number. If the inches column is greater than 12, change to feet and inches then add to the number of feet.

Example:

Multiply 1' 8" by 8.

Change 64" to feet and inches

Combine: 8' and S' 4" = 13' 4"

NOTE: On occasion it might be necessary to multiply feet and inches by feet and inches. To do this, either change to inches or change to feet using decimals.

DIVISION OF FEET AND INCHES

Two problems may require the sheet metal worker to know how to divide feet and inches. An example of one problem is the division of a piece of metal into an equal number of parts. The other problem is to determine the number of pieces of a certain size which can be made from a piece of metal of a given length.

In dividing feet and inches by a given number, the problem should be reduced to inches unless the number of feet will divide by the number evenly.

Example:

Divide 36 ft 9 in. by 4.

Since 36 is divisible by 4 evenly, you may proceed.

Example:

Divide 34 ft 9 in. by 4.

Since 34 is not divisible evenly by 4, change the problem

to inches.

104 1/4" 4 417

To divide feet and inches by feet and inches, change to inches or feet (decimals).

Example:

Example:

Same problem as above by use of ft (decimals).

It will divide 4 times with .33 ft remainder.

ANGLES

Angles are of four types:

1. Right angle-a 90 angle.

2. Acute angle-an angle less than 90.

3. Obtuse angle-an angle greater than 90, but less than 180.

4. Reflex angle-an angle greater than 180.

Privacy Statement - Press Release - Copyright Information. - Contact Us - Support Integrated Publishing