We look at the division of 86742528 by 821 
The aim is to understand the frequency of 821 in 86742528.

Advancing to step 1:
If we divide 8 by 821, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Include the next digit (6) from the dividend after 8, then repeat: 86 / 821

Let's proceed to step 2:
86 divided by 821 is 0 with a remainder of 86.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 86 and we're left with 86.
Fetch the next digit (7) from the dividend, attach it to 86 and continue: 867 / 821

Advancing to step 3:
821 goes into 867 1 times with a remainder of 46.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 821 from 867 and we're left with 46.
Include the next digit (4) from the dividend after 46, then repeat: 464 / 821

Going ahead to step 4:
If we divide 464 by 821, we get 0 and a remainder of 464.
Use 0 as the next digit of our solution. 
Result so far: 10.0
If we subtract 0 from 464, we get 464.
Append the next digit (2) from the dividend to 464 and continue with: 4642 / 821

Moving on to step 5:
821 can be fit into 4642 5 times, resulting in a remainder of 537.
Put 5 as the next digit of the answer. 
Result so far: 105.0
Deduct 4105 from 4642 and we're left with 537.
Grab the next digit (5) from the dividend, add it to 537, then carry on: 5375 / 821

Let's proceed to step 6:
821 goes into 5375 6 times with a remainder of 449.
Write down 6 as next digit of the result. 
Result so far: 1056.0
If we subtract 4926 from 5375, we get 449.
Append the next digit (2) from the dividend to 449 and continue with: 4492 / 821

Step 7:
If we divide 4492 by 821, we get 5 and a remainder of 387.
Record the quotient 5 as the next digit in the result. 
Result so far: 10565.0
Subtract 4105 from 4492 to get 387.
Take the next digit (8) from the dividend and append it to 387, then repeat: 3878 / 821

Going ahead to step 8:
821 goes into 3878 4 times with a remainder of 594.
Put 4 as the next digit of the answer. 
Result so far: 105654.0
If we take 3284 away from 3878, we end up with 594.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5940, and continue the process.

Let's proceed to step 9:
821 goes into 5940 7 times with a remainder of 193.
The next digit of our result is 7. 
Result so far: 105654.7
Subtract 5747 from 5940 to get 193.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1930, and continue the process.

Going ahead to step 10:
If we divide 1930 by 821, we get 2 and a remainder of 288.
The number 2 becomes the next digit in our result. 
Result so far: 105654.72
Subtract 1642 from 1930 to get 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

On to step 11:
2880 divided by 821 is 3 with a remainder of 417.
Record the quotient 3 as the next digit in the result. 
Result so far: 105654.723
If we take 2463 away from 2880, we end up with 417.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4170, and continue the process.

Going ahead to step 12:
When dividing 4170 by 821, we get 5 with a remainder of 65.
Record the quotient 5 as the next digit in the result. 
Result so far: 105654.7235
If we take 4105 away from 4170, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Let's proceed to step 13:
821 can be fit into 650 0 times, resulting in a remainder of 650.
Use 0 as the next digit of our solution. 
Result so far: 105654.7235
Deduct 0 from 650 and we're left with 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6500, and continue the process.

Going ahead to step 14:
821 goes into 6500 7 times with a remainder of 753.
The number 7 becomes the next digit in our result. 
Result so far: 105654.723507
Subtract 5747 from 6500 to get 753.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7530, and continue the process.

Let's proceed to step 15:
821 can be fit into 7530 9 times, resulting in a remainder of 141.
The next digit of our result is 9. 
Result so far: 105654.7235079
Subtract 7389 from 7530 to get 141.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1410, and continue the process.

Let's proceed to step 16:
1410 divided by 821 is 1 with a remainder of 589.
Use 1 as the next digit of our solution. 
Result so far: 105654.72350791
Deduct 821 from 1410 and we're left with 589.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5890, and continue the process.

The final outcome is 105654.72350791, with a leftover of 5.89e-07.