890647 divided by 81 
The aim is to understand the frequency of 81 in 890647.

Advancing to step 1:
81 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (9) from the dividend, attach it to 8 and continue: 89 / 81

On to step 2:
81 goes into 89 1 times with a remainder of 8.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 8 after subtracting 81 from 89.
Include the next digit (0) from the dividend after 8, then repeat: 80 / 81

Moving on to step 3:
If we divide 80 by 81, we get 0 and a remainder of 80.
The next digit of our result is 0. 
Result so far: 10.0
If we take 0 away from 80, we end up with 80.
Fetch the next digit (6) from the dividend, attach it to 80 and continue: 806 / 81

Going ahead to step 4:
If we divide 806 by 81, we get 9 and a remainder of 77.
Record the quotient 9 as the next digit in the result. 
Result so far: 109.0
If we take 729 away from 806, we end up with 77.
Grab the next digit (4) from the dividend, add it to 77, then carry on: 774 / 81

Let's proceed to step 5:
81 can be fit into 774 9 times, resulting in a remainder of 45.
Put 9 as the next digit of the answer. 
Result so far: 1099.0
Subtracting 729 from 774 leaves us with 45.
Take the next digit (7) from the dividend and append it to 45, then repeat: 457 / 81

Step 6:
81 goes into 457 5 times with a remainder of 52.
The number 5 becomes the next digit in our result. 
Result so far: 10995.0
Deduct 405 from 457 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 7:
520 divided by 81 is 6 with a remainder of 34.
Use 6 as the next digit of our solution. 
Result so far: 10995.6
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.

Moving on to step 8:
The number 81 fits into 340 4 times, leaving a remainder of 16.
The next digit of our result is 4. 
Result so far: 10995.64
If we subtract 324 from 340, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 9:
When dividing 160 by 81, we get 1 with a remainder of 79.
The next digit of our result is 1. 
Result so far: 10995.641
Subtracting 81 from 160 leaves us 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.

On to step 10:
81 goes into 790 9 times with a remainder of 61.
The number 9 becomes the next digit in our result. 
Result so far: 10995.6419
The remainder is 61 after subtracting 729 from 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Going ahead to step 11:
The number 81 fits into 610 7 times, leaving a remainder of 43.
The next digit of our result is 7. 
Result so far: 10995.64197
Subtract 567 from 610 to get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 12:
The number 81 fits into 430 5 times, leaving a remainder of 25.
The next digit of our result is 5. 
Result so far: 10995.641975
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.

Advancing to step 13:
When dividing 250 by 81, we get 3 with a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 10995.6419753
Subtracting 243 from 250 leaves us with 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 14:
81 goes into 70 0 times with a remainder of 70.
Use 0 as the next digit of our solution. 
Result so far: 10995.6419753
The remainder is 70 after subtracting 0 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final result is 10995.6419753 with a remainder of 7e-08.