Let's divide 921981 by 81
The aim is to understand the frequency of 81 in 921981.

Going ahead to step 1:
9 divided by 81 is 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Take the next digit (2) from the dividend and append it to 9, then repeat: 92 / 81

Advancing to step 2:
81 can be fit into 92 1 times, resulting in a remainder of 11.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 81 from 92 and we're left with 11.
Take the next digit (1) from the dividend and append it to 11, then repeat: 111 / 81

Advancing to step 3:
81 can be fit into 111 1 times, resulting in a remainder of 30.
Use 1 as the next digit of our solution. 
Result so far: 11.0
The remainder is 30 after subtracting 81 from 111.
Grab the next digit (9) from the dividend, add it to 30, then carry on: 309 / 81

Advancing to step 4:
When dividing 309 by 81, we get 3 with a remainder of 66.
The next digit of our result is 3. 
Result so far: 113.0
Subtract 243 from 309 to get 66.
Grab the next digit (8) from the dividend, add it to 66, then carry on: 668 / 81

Moving on to step 5:
668 divided by 81 is 8 with a remainder of 20.
The next digit of our result is 8. 
Result so far: 1138.0
If we take 648 away from 668, we end up with 20.
Include the next digit (1) from the dividend after 20, then repeat: 201 / 81

Advancing to step 6:
201 divided by 81 is 2 with a remainder of 39.
Record the quotient 2 as the next digit in the result. 
Result so far: 11382.0
Subtract 162 from 201 to get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Going ahead to step 7:
390 divided by 81 is 4 with a remainder of 66.
The number 4 becomes the next digit in our result. 
Result so far: 11382.4
Subtracting 324 from 390 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Step 8:
When dividing 660 by 81, we get 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 11382.48
Subtract 648 from 660 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 9:
If we divide 120 by 81, we get 1 and a remainder of 39.
The next digit of our result is 1. 
Result so far: 11382.481
Subtracting 81 from 120 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Let's proceed to step 10:
81 can be fit into 390 4 times, resulting in a remainder of 66.
Use 4 as the next digit of our solution. 
Result so far: 11382.4814
Subtract 324 from 390 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

On to step 11:
660 divided by 81 is 8 with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 11382.48148
Deduct 648 from 660 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 12:
81 can be fit into 120 1 times, resulting in a remainder of 39.
Use 1 as the next digit of our solution. 
Result so far: 11382.481481
Subtract 81 from 120 to get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 13:
390 divided by 81 is 4 with a remainder of 66.
The number 4 becomes the next digit in our result. 
Result so far: 11382.4814814
If we take 324 away from 390, we end up with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 14:
When dividing 660 by 81, we get 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 11382.48148148
If we subtract 648 from 660, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Our division results in 11382.48148148 with a remaining 1.2e-08.