889423 ÷ 81 
The aim is to understand the frequency of 81 in 889423.

On to step 1:
The number 81 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 81

Let's proceed to step 2:
81 can be fit into 88 1 times, resulting in a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 81 from 88 to get 7.
Grab the next digit (9) from the dividend, add it to 7, then carry on: 79 / 81

Let's proceed to step 3:
If we divide 79 by 81, we get 0 and a remainder of 79.
Write down 0 as next digit of the result. 
Result so far: 10.0
The remainder is 79 after subtracting 0 from 79.
Take the next digit (4) from the dividend and append it to 79, then repeat: 794 / 81

Advancing to step 4:
The number 81 fits into 794 9 times, leaving a remainder of 65.
The next digit of our result is 9. 
Result so far: 109.0
If we take 729 away from 794, we end up with 65.
Grab the next digit (2) from the dividend, add it to 65, then carry on: 652 / 81

Step 5:
If we divide 652 by 81, we get 8 and a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 1098.0
Subtracting 648 from 652 leaves us with 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 81

Advancing to step 6:
43 divided by 81 is 0 with a remainder of 43.
The number 0 becomes the next digit in our result. 
Result so far: 10980.0
If we take 0 away from 43, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Step 7:
81 goes into 430 5 times with a remainder of 25.
Put 5 as the next digit of the answer. 
Result so far: 10980.5
If we take 405 away from 430, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 8:
81 goes into 250 3 times with a remainder of 7.
The next digit of our result is 3. 
Result so far: 10980.53
Subtract 243 from 250 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 9:
When dividing 70 by 81, we get 0 with a remainder of 70.
Use 0 as the next digit of our solution. 
Result so far: 10980.53
If we subtract 0 from 70, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 10:
81 can be fit into 700 8 times, resulting in a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 10980.5308
The remainder is 52 after subtracting 648 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Going ahead to step 11:
81 goes into 520 6 times with a remainder of 34.
Record the quotient 6 as the next digit in the result. 
Result so far: 10980.53086
If we subtract 486 from 520, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 12:
81 goes into 340 4 times with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 10980.530864
If we take 324 away from 340, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 13:
160 divided by 81 is 1 with a remainder of 79.
Put 1 as the next digit of the answer. 
Result so far: 10980.5308641
Deduct 81 from 160 and we're left with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Advancing to step 14:
790 divided by 81 is 9 with a remainder of 61.
Record the quotient 9 as the next digit in the result. 
Result so far: 10980.53086419
If we take 729 away from 790, we end up with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

The final result is 10980.53086419 with a remainder of 6.1e-08.