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How do you count the decimal place values in this problem..and WHY?17.5% of $227.00

How do you know how many place values to move Left...3 is not correct...I know what it should be..but don't know why and how you know with this kind of problem..Please explain  Thanks

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Jessica P. | Education Major- Science and MORE!Education Major- Science and MORE!
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So, 

you do 277.00 X .175 = 

then subtract the answer from 277.00

you move the place values over 2 places when working with percents because they are fractions- 17.5/100 if you put that in your calculator you get .175 

There are 2 0's in 100 so you move it over 2 places. 

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