We look at the division of 73320299 by 820 
The aim is to understand the frequency of 820 in 73320299.

Advancing to step 1:
If we divide 7 by 820, we get 0 and a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Take the next digit (3) from the dividend and append it to 7, then repeat: 73 / 820

Going ahead to step 2:
820 goes into 73 0 times with a remainder of 73.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 73 leaves us with 73.
Fetch the next digit (3) from the dividend, attach it to 73 and continue: 733 / 820

Going ahead to step 3:
The number 820 fits into 733 0 times, leaving a remainder of 733.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 733 and we're left with 733.
Include the next digit (2) from the dividend after 733, then repeat: 7332 / 820

Step 4:
When dividing 7332 by 820, we get 8 with a remainder of 772.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
If we take 6560 away from 7332, we end up with 772.
Take the next digit (0) from the dividend and append it to 772, then repeat: 7720 / 820

On to step 5:
If we divide 7720 by 820, we get 9 and a remainder of 340.
The number 9 becomes the next digit in our result. 
Result so far: 89.0
If we subtract 7380 from 7720, we get 340.
Append the next digit (2) from the dividend to 340 and continue with: 3402 / 820

Let's proceed to step 6:
3402 divided by 820 is 4 with a remainder of 122.
The number 4 becomes the next digit in our result. 
Result so far: 894.0
The remainder is 122 after subtracting 3280 from 3402.
Fetch the next digit (9) from the dividend, attach it to 122 and continue: 1229 / 820

Going ahead to step 7:
The number 820 fits into 1229 1 times, leaving a remainder of 409.
Record the quotient 1 as the next digit in the result. 
Result so far: 8941.0
Deduct 820 from 1229 and we're left with 409.
Append the next digit (9) from the dividend to 409 and continue with: 4099 / 820

Step 8:
The number 820 fits into 4099 4 times, leaving a remainder of 819.
The number 4 becomes the next digit in our result. 
Result so far: 89414.0
If we take 3280 away from 4099, we end up with 819.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8190, and continue the process.

Let's proceed to step 9:
When dividing 8190 by 820, we get 9 with a remainder of 810.
Put 9 as the next digit of the answer. 
Result so far: 89414.9
The remainder is 810 after subtracting 7380 from 8190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8100, and continue the process.

Going ahead to step 10:
820 goes into 8100 9 times with a remainder of 720.
Use 9 as the next digit of our solution. 
Result so far: 89414.99
If we subtract 7380 from 8100, we get 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7200, and continue the process.

After the division, we end up with 89414.99 and a remainder of 0.72.