Five and nine hundredths.
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Expressed as a decimal number, 509/100 is equal to 5.09.
5.09 is already a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 509/100.
209 + 300 = 509
509/100 5 9/100
509=DIX