Let's divide 86621520 by 800
The aim is to understand the frequency of 800 in 86621520.

Advancing to step 1:
8 divided by 800 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Include the next digit (6) from the dividend after 8, then repeat: 86 / 800

Let's proceed to step 2:
If we divide 86 by 800, we get 0 and a remainder of 86.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 86 leaves us with 86.
Include the next digit (6) from the dividend after 86, then repeat: 866 / 800

Advancing to step 3:
If we divide 866 by 800, we get 1 and a remainder of 66.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 800 from 866 and we're left with 66.
Fetch the next digit (2) from the dividend, attach it to 66 and continue: 662 / 800

Let's proceed to step 4:
The number 800 fits into 662 0 times, leaving a remainder of 662.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Deduct 0 from 662 and we're left with 662.
Bring next digit (1) of the dividend behind the 662 and repeat the process: 6621 / 800

Advancing to step 5:
800 can be fit into 6621 8 times, resulting in a remainder of 221.
Write down 8 as next digit of the result. 
Result so far: 108.0
Subtract 6400 from 6621 to get 221.
Grab the next digit (5) from the dividend, add it to 221, then carry on: 2215 / 800

Moving on to step 6:
800 can be fit into 2215 2 times, resulting in a remainder of 615.
Write down 2 as next digit of the result. 
Result so far: 1082.0
Subtracting 1600 from 2215 leaves us with 615.
Append the next digit (2) from the dividend to 615 and continue with: 6152 / 800

Going ahead to step 7:
When dividing 6152 by 800, we get 7 with a remainder of 552.
The next digit of our result is 7. 
Result so far: 10827.0
Subtract 5600 from 6152 to get 552.
Bring next digit (0) of the dividend behind the 552 and repeat the process: 5520 / 800

Step 8:
The number 800 fits into 5520 6 times, leaving a remainder of 720.
Record the quotient 6 as the next digit in the result. 
Result so far: 108276.0
Subtract 4800 from 5520 to 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.

Advancing to step 9:
7200 divided by 800 is 9 with a remainder of 0.
The next digit of our result is 9. 
Result so far: 108276.9
Subtracting 7200 from 7200 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 10:
If we divide 0 by 800, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 108276.9
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 11:
The number 800 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 108276.9
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 108276.9 and a remainder of 0.0.