What are tenths fifths and fourths easy to convert to percents

Tenths: 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%

fifths: 20%, 40%, 60%, 80%,100%

fourths: 25%, 50%, 75%, 100%

P. S. I'm doing this like:

tenths: something/10

fifths: something/5

fourths: something/4