Decimal Number Recognition: Finding the Value Equal to 0.5

In order to determine the correct answer, let's first add 0 to the number as follows:

$0.5=0.50$

Observe the answers:

0.50 - Both numbers are identical to each other, hence this is the correct answer.

0.505 - Let's add 0 to our number and compare 0.500 to 0.505. Given that the thousandths digit is 5 and in our number it's 0, the numbers are not identical, this is not the correct answer.

0.05 - Due to the fact that the tenths digit and hundredths digit are different from each other, meaning 0 and 5 versus 5 and 0, this is not the correct answer.

0.55 - Since the hundredths digit is 5 and in our number it's 0, the numbers are not identical, this is not the correct answer.