You have to know, "percentage of what". For example, 30% of 1000 = 30/100 of 1000 = 30/100 x 1000 = 300.
Probably faster like this: 30% of 1000 = 0.30 x 1000 = 300.
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I guess you mean find the percentage of one number of another, eg what percentage of 100 is 30: Divide the number for which the percentage of the other is required by the other number (making it a fraction of the second number) and multiply it by 100 %.
The answer depends on whether you wish to find one number as a percentage of another or if you want a given percentage of a number.
find it urself fool
To find the percentage of one number you divide the numbers then multiply the answer by 100. For an example, if you want to find the percentage of four that the number three is you divide three by four and then multiply the result ,which is 0.75, by 100 and your result or percentage would be 75%!
Get the denominator to be 100.