5.25 is, itself, 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 525/100. You can simplify this rational fraction if you so wish.
0.525 written as a fraction = 525/1000
tl
It is 525/1 inches.
525% = 21/4
It is 525/1 grams. If you want it expressed as a fraction of some other quantity then you need to specify the second quantity.
525/1
525/1000 = 21/40
525 = 525/1, although I see no reason why anyone would wish to write it like that.
1.3125
Well, isn't that a happy little question! To turn 525% into a fraction, we first remember that percent means "per hundred." So 525% is the same as 525/100. To simplify this fraction, we can divide both the numerator and denominator by 25 to get 21/4. And just like that, we've created a lovely, simplified fraction from our original percentage.
525% = 5.25 = 525/100 = 21/4 = 51/4
2/5