if you mean ratio? lets say its 1 to 5 make the denominator 100 (in this case by multiplying top and bottom by 20) the top number will be the percent (in this case: 1 x 20 = 20 therefore 20%)
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5 percent you write as 5% then you put it into a decimal as .5. Then wite it as a fraction as 5 over 10. Then reduce by 5 then you get one half.
point zero one fiveOne and five tenths percent.
It's pretty simple. Every percent is out of 100. There is no possible percent higher than one hundred. So, when a percent needs to be changed into a decimal, you move it 2 decimal points to the left. This is so because percent means parts of 100, where 100 has 2 zeros. For example: 80% is 80/100. 80/100 = .8, so you move the decimal point two times to the left. When you rewrite a decimal as a percent, you do the opposite; move it two decimal points to the right. Make sure that the decimal is not greater than one because one is equal to 100% and as I said before, nothing can be greater than 100%. For example: .9934 = 99.34% or 99.34/100; move the decimal two to the right. I hope that helps.
20 percent of 12 refers to one-fifth of 12 and hence, in fraction, it is 12/5 because, if we rewrite in exponential form, it is 12*(20/100) = 12/5