Expressed as a vulgar fraction in its simplest form, 45 percent is equal to 9/20, or nine twentieths. Expressed as a decimal fraction, 45 percent is equal to 0.45.

Change the ratio into a fraction and change the fraction into a percent. For example: 9:100 - Ratio 9/100 - Fraction 9% - Percent Example 2: 5:20 5/20 5/20 = 25/100 (You denominator *20* x *5* will equal 100) 25%