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Converting a Percent to a Decimal
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1. Our Training Videos
Skills Application: Converting a Percent to a Decimal
Step-by-Step: Converting a Percent to a Decimal
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2. Running with Pi

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Engine bolts that hold engine block segments together are tightened in 2 stages. First, bolts are pre-tightened to 70% of the final torque during the assembly to compress the seals between the segments evenly. Apprentices need to convert this torque percent to a decimal number to calculate maximum pre-tightening torque. If the conversion is off, the seals could seat unevenly, which means the new engine is likely to leak oil.

Running with Pi

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3. Our Training Worksheets
To change a percent to a decimal number, divide by 100. Division by 100 is the same as moving the decimal point two digits to the left.

A Short Review

Example:
20% = ?
(Decimal point reminder: 20 = 20.00)
1. Move the decimal point two places to the left.
2. Remove the % symbol.

Worksheet: Level 1

The operations used are clearly specified. Only one type of mathematical operation is used in a task.

Worksheet: Level 1 Sample Question

Example:
Convert to decimal:
15% = ?

15% = 0.15

Worksheet: Level 2

Tasks involve one or two types of mathematical operation. Few steps of calculation are required.

Worksheet: Level 2 Sample Question

Example:
Convert to decimal:
3% = ?

3% = 0.03

Steps:
3% =
$\frac{3}{100}$
$\frac{3}{100}$
= 3 ÷ 100
3 ÷ 100 = 0.03

Tasks involve multiple steps of calculation. Advanced mathematical techniques may be required.

Another Way to Get the Answer

Convert 3.2% to a decimal.

Another way to get the answer, using only division:

1. First off, recognize that percents can be written as a decimals. Percents are related to decimals, they can be converted back-and-forth.

2. Set up the problem:

percent ÷ 100 = decimal

This 100 comes from the fact that percents always have an invisible “divided by 100” concept with them. The % sign is actually short for “out of or divided into 100”.

3. Calculate: 3.2 ÷ 100  = 0.032

4. Take a pencil and write down 0.032 Now you`re done with the math.

5. The last step: check your work, make sure everything was copied and written correctly then determine that the correct way to write the answer is 0.032