A decimal cannot be simplified into another decimal except by deleting trailing 0s or rounding ... 999 recurring upwards.
But there certainly are cases where a ratio is simpler to understand and even work with than its decimal equivalent.
For example:
0.42857142857... = 3/7
or
0.078125 = 5/64
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6.15 is a fraction. It is a fraction in decimal form but that does not stop it being a fraction. And, as a decimal fraction, it cannot be simplified. Its rational equivalent is 615/100 which can be simplified to 123/20.
It is: 88% = 0.88 as a decimal and 22/25 as a fraction simplified
78% is 0.78 as a decimal and 39/50 as a simplified fraction
It's already a simplified decimal but as a fraction in its lowest terms it is 21/25
The decimal 2.14560 can be simplified to the fraction 42912/20000 by removing the decimal point and reducing the fraction to its simplest form. The fraction is equivalent to 10728/5000 when further simplified. The decimal 2.1456 is equivalent to the fraction 2682/1250 when simplified. The fractions are not the same due to the additional zero in the first decimal number.