Converting a fraction to a percent

Many students find it difficult to convert fractions to percentages, because sometimes it is not so obvious what the answer is. 

The easiest and quickest way to introduce this process is to teach students how to estimate the percentage.  First, make the students get used to the idea of changing the denominator to a 100.  In order to do so, the denominator must be multiplied by a certain number.  To keep the fraction the same, we have to multiply the nominator by that same number.  Obviously, since we're working with whole numbers in this technique, the number in question is only going to be an approximation, but it helps the students get really close to the answer.  For example, if we are trying to find the percent of 8/26, we know that to get 100 as a denominator, we have to multiply both 8 and 26 by a number a bit less than 4 (since 100/4 = 25), so the percent would be slightly less than 32%.

I believe that by teaching the conversion this way, there is a good chance that students would have a better understanding about the relationship between fraction and percentage.