543 There is no need to change anything.
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In the decimal system a tenth is 0.1 so there are no tenths involved here and the rounding is no approximation: 543.0
1000011111
DXLIII
Oh, what a happy little question! To write 543 as a fraction, you simply place it over 1, like this: 543/1. Isn't that just lovely? Remember, there are so many ways to express numbers, each one a unique and beautiful expression of math.
-- The decimal system (base-10) uses 10 digits to write all numbers. -- The binary system (base-2) uses 2 digits to write all numbers.