5.15 is 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. And, being a decimal, there is no simpler form. Its rational equivalent is 515/100 which can be simplified to 5 3/20.
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515 in an integer, not a fraction!
515/10000 = 5.15*10-2
515
Five hundred fifteen.
The infinitely many multiples of 515: 515*1, 515*2, 515*3 etc.