Calculate Percentage: Converting 630 over 30 to Percent Form

To solve this problem, we aim to determine what percentage 630 is of 30. To do this, we will use the percentage formula:

$\text{Percentage} = \left( \frac{\text{part}}{\text{whole}} \right) \times 100\%$

• Step 1: Divide the part by the whole.
  Here, the part is 630, and the whole is 30. Thus, we calculate:
  $\frac{630}{30} = 21$

• Step 2: Convert the result into a percentage.
  Now, we take the result from step 1, which is 21, and multiply it by 100:
  $21 \times 100 = 2100\%$

Therefore, 630 is $2100\%$ of 30.

The correct answer, according to the given choices, is $\textbf{2100\%}$.