To determine how many times greater 821 is than 8, we can perform the calculation:
\[ \frac{821}{8} = 102.625 \]
So, 821 is 102.625 times greater than 8.
Next, let's look at how to express the number 2 and 18.21 in relation to 821. Since you provided 8, 2, and 18.21 without clear separation, I assume you are interested in the number 2.
To find how many times greater 821 is than 2:
\[ \frac{821}{2} = 410.5 \]
So, 821 is 410.5 times greater than 2.
Now, let's calculate how many times greater 821 is than 18.21:
\[ \frac{821}{18.21} \approx 45.1 \]
So, 821 is approximately 45.1 times greater than 18.21.
Next, we need to find what fractional part 2 (considering just the number 2) is of 821:
\[ \frac{2}{821} \]
This value is approximately:
\[ \frac{2}{821} \approx 0.00243 \]
So as a fraction, it stays as \(\frac{2}{821}\).
If we assess the original question, we find:
- 821 is approximately 102.625 times greater than 8.
- 821 is 410.5 times greater than 2.
- 821 is approximately 45.1 times greater than 18.21.
As a fractional part of 821, 2 is \(\frac{2}{821}\).