They are different ways of writing the same number.
For example,
0.04, 1/25, 0.22, 5-2, 4% (and there are more) are all equivalent representations.
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Two numbers that are equivalent to 5.05 are 5 1/20 and 505/100. This is because 5.05 can be expressed as a mixed number (5 1/20) or as an improper fraction (505/100). Both of these representations are equivalent to the decimal 5.05.
A 4-bit nibble has 2^4 = 16 possible representations and we can symbolise any one of these representations using just one hexadecimal (base 16) digit.
graphical representations
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It is: 0.3 is greater than 0.12