If you mean $1 then it is 45/100 or 9/20 in its simplest form
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The number 45 is the same as 45/1, therefore you can change 45 to a fraction of 45/1.
45.0 = 45/1
Ten cents = 1/10 of a dollar.
1/2
5 dimes is fifty cents. Fifty cents is a half dollar so the fraction is 1/2.