We're dividing 86610050 by 821 
The aim is to understand the frequency of 821 in 86610050.

Let's proceed to step 1:
8 divided by 821 is 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 821

Advancing to step 2:
When dividing 86 by 821, we get 0 with a remainder of 86.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Grab the next digit (6) from the dividend, add it to 86, then carry on: 866 / 821

Going ahead to step 3:
821 can be fit into 866 1 times, resulting in a remainder of 45.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 821 from 866, we get 45.
Take the next digit (1) from the dividend and append it to 45, then repeat: 451 / 821

Moving on to step 4:
821 goes into 451 0 times with a remainder of 451.
The next digit of our result is 0. 
Result so far: 10.0
The remainder is 451 after subtracting 0 from 451.
Take the next digit (0) from the dividend and append it to 451, then repeat: 4510 / 821

Moving on to step 5:
When dividing 4510 by 821, we get 5 with a remainder of 405.
Put 5 as the next digit of the answer. 
Result so far: 105.0
If we take 4105 away from 4510, we end up with 405.
Take the next digit (0) from the dividend and append it to 405, then repeat: 4050 / 821

On to step 6:
4050 divided by 821 is 4 with a remainder of 766.
Write down 4 as next digit of the result. 
Result so far: 1054.0
Subtract 3284 from 4050 to get 766.
Bring next digit (5) of the dividend behind the 766 and repeat the process: 7665 / 821

Going ahead to step 7:
If we divide 7665 by 821, we get 9 and a remainder of 276.
Write down 9 as next digit of the result. 
Result so far: 10549.0
Subtract 7389 from 7665 to get 276.
Fetch the next digit (0) from the dividend, attach it to 276 and continue: 2760 / 821

Advancing to step 8:
If we divide 2760 by 821, we get 3 and a remainder of 297.
Record the quotient 3 as the next digit in the result. 
Result so far: 105493.0
If we subtract 2463 from 2760, we get 297.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2970, and continue the process.

Let's proceed to step 9:
821 can be fit into 2970 3 times, resulting in a remainder of 507.
Use 3 as the next digit of our solution. 
Result so far: 105493.3
Subtract 2463 from 2970 to get 507.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5070, and continue the process.

Moving on to step 10:
When dividing 5070 by 821, we get 6 with a remainder of 144.
The next digit of our result is 6. 
Result so far: 105493.36
The remainder is 144 after subtracting 4926 from 5070.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

Advancing to step 11:
The number 821 fits into 1440 1 times, leaving a remainder of 619.
Write down 1 as next digit of the result. 
Result so far: 105493.361
Subtracting 821 from 1440 leaves us with 619.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6190, and continue the process.

Moving on to step 12:
If we divide 6190 by 821, we get 7 and a remainder of 443.
Put 7 as the next digit of the answer. 
Result so far: 105493.3617
Deduct 5747 from 6190 and we're left with 443.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4430, and continue the process.

Moving on to step 13:
821 can be fit into 4430 5 times, resulting in a remainder of 325.
The number 5 becomes the next digit in our result. 
Result so far: 105493.36175
Deduct 4105 from 4430 and we're left with 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

On to step 14:
3250 divided by 821 is 3 with a remainder of 787.
The number 3 becomes the next digit in our result. 
Result so far: 105493.361753
Subtracting 2463 from 3250 leaves us with 787.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7870, and continue the process.

Moving on to step 15:
The number 821 fits into 7870 9 times, leaving a remainder of 481.
The next digit of our result is 9. 
Result so far: 105493.3617539
The remainder is 481 after subtracting 7389 from 7870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4810, and continue the process.

Going ahead to step 16:
821 can be fit into 4810 5 times, resulting in a remainder of 705.
Record the quotient 5 as the next digit in the result. 
Result so far: 105493.36175395
The remainder is 705 after subtracting 4105 from 4810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7050, and continue the process.

After the division, we end up with 105493.36175395 and a remainder of 7.05e-07.