986876 divided by 81 
The aim is to understand the frequency of 81 in 986876.

On to step 1:
When dividing 9 by 81, we get 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Bring next digit (8) of the dividend behind the 9 and repeat the process: 98 / 81

Moving on to step 2:
81 can be fit into 98 1 times, resulting in a remainder of 17.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 17 after subtracting 81 from 98.
Append the next digit (6) from the dividend to 17 and continue with: 176 / 81

On to step 3:
81 can be fit into 176 2 times, resulting in a remainder of 14.
Write down 2 as next digit of the result. 
Result so far: 12.0
Subtracting 162 from 176 leaves us with 14.
Bring next digit (8) of the dividend behind the 14 and repeat the process: 148 / 81

Going ahead to step 4:
If we divide 148 by 81, we get 1 and a remainder of 67.
Put 1 as the next digit of the answer. 
Result so far: 121.0
Subtracting 81 from 148 leaves us with 67.
Fetch the next digit (7) from the dividend, attach it to 67 and continue: 677 / 81

Step 5:
81 goes into 677 8 times with a remainder of 29.
Write down 8 as next digit of the result. 
Result so far: 1218.0
Subtracting 648 from 677 leaves us with 29.
Grab the next digit (6) from the dividend, add it to 29, then carry on: 296 / 81

On to step 6:
When dividing 296 by 81, we get 3 with a remainder of 53.
Write down 3 as next digit of the result. 
Result so far: 12183.0
Deduct 243 from 296 and we're left with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Let's proceed to step 7:
530 divided by 81 is 6 with a remainder of 44.
The number 6 becomes the next digit in our result. 
Result so far: 12183.6
If we take 486 away from 530, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 8:
If we divide 440 by 81, we get 5 and a remainder of 35.
The number 5 becomes the next digit in our result. 
Result so far: 12183.65
Subtracting 405 from 440 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

On to step 9:
81 goes into 350 4 times with a remainder of 26.
Record the quotient 4 as the next digit in the result. 
Result so far: 12183.654
Subtract 324 from 350 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 10:
81 can be fit into 260 3 times, resulting in a remainder of 17.
The next digit of our result is 3. 
Result so far: 12183.6543
The remainder is 17 after subtracting 243 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 11:
81 goes into 170 2 times with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 12183.65432
Deduct 162 from 170 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 12:
81 can be fit into 80 0 times, resulting in a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 12183.65432
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 13:
When dividing 800 by 81, we get 9 with a remainder of 71.
Put 9 as the next digit of the answer. 
Result so far: 12183.6543209
If we take 729 away from 800, we end up with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Let's proceed to step 14:
710 divided by 81 is 8 with a remainder of 62.
Record the quotient 8 as the next digit in the result. 
Result so far: 12183.65432098
If we take 648 away from 710, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

The final result is 12183.65432098 with a remainder of 6.2e-08.