Compare 230/100 and 2.3: Choosing the Correct Mathematical Symbol

We begin by converting $\frac{230}{100}$ into a decimal form. To do this, we divide 230 by 100:

$\frac{230}{100} = 230 \div 100 = 2.3$

Now, we compare this result to the given decimal 2.3.

Since $2.3 = 2.3$, the appropriate sign to use between $\frac{230}{100}$ and 2.3 is $"="$.

Therefore, the solution to the problem is $\mathbf{=}$.