It is 615/100. You can simplify this rational fraction if you require.
3.23 as a simplified fraction = 323/100
0.76 = 19/25 as a fraction simplified
6.6 as a simplified fraction is 33/5
615 is a time of day: it is not, and cannot be expressed, as a fraction of an hour.
6.15 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is 615/100 which can be simplified. But simplification means that you lose information about the precision of the fraction.
It is 615/100. You can simplify this rational fraction if you require.
? no.
0.05 as a fraction simplified is 1/20
3.23 as a simplified fraction = 323/100
0.76 = 19/25 as a fraction simplified
6.6 as a simplified fraction is 33/5
11/26 is the simplified fraction
615 is a time of day: it is not, and cannot be expressed, as a fraction of an hour.
61.5% (0.615) as a fraction is 615/1000, which simplifies to 123/200
0.875 as a simplified fraction is 7/8
0.644 as a simplified fraction = 644/1000 = 161/250