What decimal is equivalent to 0.550?

0.550 is the DECIMAL. There is no equivalence.

0.550 / 0.1000 is the fraction.

0550/1000 =

550/1000

Cancel down by '50'.

11/20 is the fraction.

If you converted 11/20 or 44/80 back to a decimal the answer would still be 0.55