The fractional notation for 1 is 1, or it could also be any whole number atop itself (i.e. 1/1, 2/2, 257/257, 716948355/716948355)...
Did you mean 'What is fractional notation for 1%?'? That seems to make more sense to me: 1% (or one per hundred), is 1/100.
Any whole number in fractional notation is itself over 1. so, 2 in fractional notation is 2/1. Simple!
6 1/5 IS in fractional notation.
10 1/8 IS in fractional notation.
The fractional notation of 125% would be 125/100 or 5/4 or 1 1/4
450/1
15/1
5/1
55/1
44396/1
1/4
1/4
170/1