# Carpentry & Building Construction

## Math Activities :

### Converting Fractions to Decimals

Measuring the size of objects and distances involves fractions. Sometimes a fraction needs to be changed into a decimal. Carpenters may use a calculator to convert from one form to the other, or they may use a conversion table.

To use a basic calculator to convert fractions into decimals:
1. Key in the digits of the numerator.
2. Press the ÷ (divide) key.
3. Key in the digits of the denominator.
4. Press the = (equals) key.
5. Round the decimal to the nearest ten-thousandth.

When converting a mixed number, such as 4 5/64, keep the whole number (4) and convert the fraction (5/64). Combine the whole number and decimal to read as one number.

 Terms, Symbols, & Abbreviationsnumerator - top number in a fractiondenominator - bottom number in a fraction

Practice Exercise

 Using a calculator, convert 5/64 into a decimal. Express the answer to the nearest ten-thousandth. Step 1 Key in 5 for the numerator. Step 2 Press the ÷ (divide) key. Step 3 Key in 64 for the denominator. Step 4 Press the = (equals) key. Step 5 Round the answer, 0.078125, to the nearest ten-thousandth.
The answer is 0.0781.

Decimal-Fraction Equivalents table (19.0K)

Use a calculator or the Decimal/Fraction Equivalents table to solve the following problems.

 1 Convert 3 3/16 to a decimal and round to the nearest ten-thousandth. A) 0.1875 B) 1.1875 C) 3.1875 D) 3.19 2 The decimal equivalent of 1/3 is closest to A) 0.0625 B) 0.1250 C) 0.3125 D) 0.5625 3 The decimal equivalent of 11/32 to the nearest ten-thousandth is A) 0.3400 B) 0.3438 C) 3.3437 D) 11.3437 4 A 5/8'' subfloor and 25/32'' flooring were installed in a kitchen. The total floor thickness as a decimal is A) 1.4063'' B) 1.6250'' C) 0.6250' D) 0.7812'' 5 The thickness of the baseboard molding you will be installing is 0.6875'', or A) 3/8'' B) 3/4'' C) 5/16'' D) 11/16''