81.8% is basically 81.8 divided by 100 i.e. 81.8/100. Now, if you have to divide a number by 10, 100, 1000, 10,000 etc. etc. all you have to do is move back the decimal point of the numerator/ shift the decimal point to the left, how many ever times there are zeros. So, your 81.8%, which is 81.8/100 is 0.818, because you shifted the same number of zeros in 100 in 81.8.
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