To find the ratio of girls to boys, we start with the number of girls and boys in the reading group.
The number of girls is 5 and the number of boys is 9. The ratio of girls to boys can be expressed as:
\[ \text{Ratio} = \frac{\text{Number of Girls}}{\text{Number of Boys}} = \frac{5}{9} \]
Now, let's calculate this as a decimal:
\[ \frac{5}{9} \approx 0.555555... \]
To round this to the nearest hundredth, we look at the third decimal place (the "5" in this case):
\[ 0.555555... \approx 0.56 \]
Thus, the ratio of girls to boys, represented as a decimal and rounded to the nearest hundredth, is:
\[ \boxed{0.56} \]
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