45, like any integer, can be written as a fraction in simplest form by putting it over 1.
45% = 9/20
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45 is an integer and so there is no sensible way of writing it as a fraction. However, you could write it as 45/1.
6/45 = 2/15
As a fraction 0.45 is 45/100. In simplest form it is 9/20.
45 divided by 117 in its simplest form as a fraction is 5/13
45/100ths.
-2/5