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CHANGING DECIMALS TO PERCENTS
Jump right to the exercises!
See the best ALGEBRA PINBALL time for this exercise
The concepts for this exercise are summarized below.
For a complete discussion, read the text.
One use for decimals is in working with percents, which are commonplace in everyday life:
- the dress was on sale for 40% off the original price;
- housing costs rose 5% last year;
- there was a 150% increase in telephone activity after the newspaper advertisement.
There are 100 cents in a dollar.
A century is 100 years.
The word percent means per one hundred .
The symbol % is used for percent.
Whenever you see the symbol % , you can trade it in
for a factor of 1/100 .
Whenever you see a factor of 1/100 , it can be traded in for a % symbol.
This simple idea is the key to success with percents:
Indeed, the symbol % even looks like the fraction 1/100 ; it has the two
zeros and the division bar!
To change from a decimal to a percent, move the decimal
point two places to the right and insert the percent symbol.
Here are some examples:
0.03 = 3%
2.5 = 250%
1.008 = 100.8%
Here's the idea that makes this work:
0.03 = 3(1/100) = 3%
2.5 = 2.50 = 250(1/100) = 250%
Notice that the 1/100 gets traded in for the percent symbol.
Here, you will practice renaming decimals as percents.
For example, 0.54 gets renamed as 54% .